Kelly Devon asked:


 

Communication has matured with the invention of advanced technology. The most remarkable addition in the communication technology is mobile phone. As communication becomes the most important element in this modern age, mobile phones have become a necessary tool in people’s life. Now, even life seems aimless without mobile phone, feeling of detachment from friends and relatives comes to the mind. But, nowadays, availing a mobile phone is not at all a subject to worry about. Because, there are numerous mobile phone manufacturers out there in the International marketplace which are offering mobile phones at a very reasonable price.

For surviving in the cut-throat competition in the marketplace, mobile phone manufacturers are offering customers multiple schemes for selling mobile phones. Some of the most popular and best selling schemes are Pay as you go phones, Contract phones and SIM Free phones. Here, in this articles, we will discuss about the SIM free mobile phones and will be exploring the reason behind their huge popularity.

Now in the large marketplace of mobile phones, choosing the right mobile network plan is really difficult. All the mobile network-providing companies are coming with a perfect combination of elegant phones, reasonable price and quality service. But in case of Sim free mobile phones, you will just have to purchase your desirable phone and you will have the full independence to change the network without informing the network provider company. With the technological innovation, there have been the introduction of several communication technologies including the Global system for mobile communications (GSM), Code division multiple access (CDMA), Time division multiple access (TDMA) and Integrated digital enhanced network (iDEN). Among them the most popular technology all over the world is the GSM technology. As all the SIM free mobile phones work on GSM technology, its popularity is also on the top position.

The people of United Kingdom do prefer pay-as-you-go mobile service and contract mobile phones for availing a compactness of mobile phone with the network connection. But, SIM free phones are a bit different from all these kind of phones. By going for SIM Free Mobile Phones, the user is not bound to avail a mobile connection from any particular network. He will have the full rights to choose a network provider according to his own preference. Here it should be mentioned that SIM stands for Subscriber Identity Module which is basically a chip that connects mobile handset with the mobile network. With the pay-as-you-go and contract phones, one has to take a fixed network service which is being offered by a particular schemes. After availing phone under contract schemes, users if not get satisfaction after few moths then he will not be able to switch over to other network provider. But on the other hand, by going for SIM free mobile phones, users need not face this kind of discrepancy. They will have the full independence to switch on to any other network provider without informing the previous service provider or the mobile company. These kind of phones are also different from the Pay-as-you-go phones. Under the scheme of pay-as-you-go phone, with the handset users will get a particular network connection. Though the users are not bound to continue that service for a time period, he will be free to discontinue the network service and switch over to other network.

Now almost all the giant mobile manufacturers are offering SIM free mobile phones. These include Motorola, Nokia, Samsung, LG, Sony Ericsson name of a few. In this current era of advanced technology, all the SIM free mobile phones are equipped with innovative design, attractive looks, world-class user-friendly features and high-quality technology. To survive in current cut-throat competition of the modern marketplace, manufacturers are now offering the elegant mobile handsets at a very reasonable price. That’s why customers do not need to bother about the quality and price while choosing their favourite mobile phone.

Online mobile phone shops are now the perfect place for availing a best offer of SIM free mobile phones. There are various online shops which give mobile phone offers with variety of attractive gifts with purchase of these kind of phones, which include discounts, free gifts, free SMSs and so on.



LIMONES

Dharmendra Chaudhary asked:


The wireless technology is here to stay.  The mobile industry is growing in power, hour by hour.  The mobile manufacturing companies are churning out newer and more hi-tech models for all kinds of users. The mobile dealers and the mobile companies have to come up with amazing offers to encourage the customer to buy a mobile connection.  The advertisement of the mobile and the networking services is through the mobile phone offer.

The Mobile Phone Offer and the Internet

The mobile phone offer is found if you browse through the Internet.  The many mobile dealer websites will present you with great offers if you are interested in getting a mobile connection.  There are offers for the business and personal use of the mobile and the leading networks in the country work hard in coordination with the leading mobile brands to promote the purchase of a mobile connection and mobile.  You can check with the Internet and study the various offers between mobile wireless connection such as 3G and Nokia or Orange with Sony Ericsson before you decide just what mobile phone offer is made to you.

The mobile phone offer and the Wireless connections

The mobile phone offers are given by the wireless connections such as O2, T Mobile, Vodafone and 3G among others along with some of the leading brands of mobiles.  The mobile phone offers include free mobile phone, accessories for mobile phone such as headsets and interesting tariff rates that suit every customer. The mobile phone offer involves selective and innovative models of some of the leading brands of mobiles such as Nokia, LG, Samsung, Sony Ericsson and Motorola among others.

The mobile phone offer

The mobile phone offer is worked out to suit the budget of every pocket and even has the cash back deal in the form of free one year rental on the mobile phone deal which can be renewed after validity period.  There are free gifts if there is stock clearance on existing models and other accessories such as free headsets, etc and extra features that are available on the mobile phone deal offer.



FORNEY

Astin Sharon asked:


There were days, when we used to meet a person for the first time, and try to observe his shoes, clothing or his wrist watch. The single reason for judging the person on these minor things was to know the personality of the person. But these traits have become old, now what we search for is the kind of mobile phone the person is carrying. For us, the type of mobile phone helps us determine the personality of a person.

UK market has seen a sudden growth in the mobile phone industry. Mobile phones have become a necessity, rather than being an item of luxury. This is the reason why many mobile phone companies and network providers have come close to provide distinctive as well as cheap mobile phone deals.

One can find a large number of network providers like O2, T, orange and virgin in UK market that too with interesting as well as cheap mobile phone deals. One can find these deals with all the major mobile phone manufacturers like Nokia, Samsung, Sony Ericsson, Motorola and Blackberry.

From all these lucrative mobile phone deals, the most attractive and seamless deals are the contract mobile phone deals, Pay as you go mobile phone deal and sim free mobile phone deal. What makes these deals more attractive is that one can find these deals on all the new handsets flourishing in the market.

To start with, contract mobile phone deal is considered the most attractive mobile phone deal, as with this deal, the person enters into a contract with a particular network provider. This deal consists of contract which can be a 12 months rental scheme or an 18 months rental scheme. The most attractive part with this deal is that, one can enjoy a free handset, many a times available with this mobile phone deal.

This is not the end, along with this deal; the company also, provides many free gifts and vouchers to the customers. Cash back, free accessories, free line rental for twelve months and free mobile batteries are one of the many attractions attached with contract mobile phone deals. If in case the contract finishes, the customers can enjoy the liberty of changing their current handset and choose a latest one.

For those people who travel extensively or those who have to face heavy mobile bills every month, pay as you go mobile phone deal is the best option. As a part of this scheme, the customers pays the amount in advance, and use the phone till the amount he has paid, finishes.

In case of sim free mobile phone deal, consumers can purchase the handset of their choice and also choose the network provider of their interest. Thus it is a very flexible deal, which is also simple to understand.

The best part is that now, one can purchase these mobile phones online. There are many well known online mobile stores who understand the need of the customers and provide qualitative products. So, make the best use of offers and grab a mobile phone with great features.



COREY

harinath asked:


MOBILE COMMUNICATIONS

Mobile communication is the application of wireless technology in the access network. It offers many useful features,

• Easy installation for rapid roll out

• Proven platform with scalability

• Future proof

• Reliable and secure

• Mobility

It is a very rapidly growing and popular service which was revolutionised telecommunications. It has become a backbone for business success and efficiency. It connects subscribers to the public switched telephone network(PSTN) using radio signals as a substitute for copper.it allows any body to communicate with any one while on the move.

Different technologies emerged for different types of requirements-coverage, capacity, mobility, bandwidth.

GSM

CDMA

CORDECT

PHS

AMPS,DAMPS

EVOLUTIONS OF MOBILE COMMUNICATIONS:-

FIRST GENERATION(1G):ANALOG CELLULAR:-

The introduction to cellular systems in the late 1970s and early 1980s represented a quantum leap in mobile communication(especially in capacity and mobility). Semiconductor technology and microprocessors made smaller and lighter weight , and more sophisticated mobile systems a practical reality for many more users. These 1G cellular systems still transmit only analog voice information. The most prominent 1G systems are ANALOG MOBILE PHONE SYSTEM(AMPS), NORDIC MOBILE TELEPHONE(NMT) and TOTAL ACCESS COMMUNICATION SYSTEMS(TACS). With the 1G mobile introduction, the mobile market showed annual growth rates of 30 to 50 percent, rising to nearly 20 million subscribers by 1990.

SECOND GENERATION(2G):MOBILE DIGITAL SYSTEMS:-

The development of 2G cellular systems was driven by the need to improve transmission quality, system capacity and coverage. Further advances in semiconductor technology and microwave devices brought digital transmission to mobile communications.sppech transmission still dominates the airways,but the demands for fax,short message and data transmissions are growing rapidly. Supplementary services such as fraud prevention and encrypting of user data have become standard features that are compatible to those in fixed networks. 2G cellular systems include GSM, DIGITAL AMPS(D-AMPS),CDMA and PERSONAL DIGITAL COMMUNICATION. Today multiple 1G and 2G standards are used in world wide mobile communications. Different standards serve different applications with different levels of mobility, capability and service area standards are used only in one country or region and most are in compatible.

2G TO 3G GSM: EVOLUTION:-

Phase 1 of the standardization of GSM 900mhz band was completed by the EUROPEAN TELECOMMUNICATION STANDARD INSTITUTE (ETSI) in 1990 and included all necessary definitions for the GSM network operations. Several tele services and bearer services have been defined (including data transmission upto 9.6kbps), but only some very basic supplementary services offered. As a result, GSM standards were enhanced in phase 2 (1995) to incorporate a large variety of supplementary services that were compatible to digital fixed network integrated services digital network(ISDN) standards. In 1996, ETSI decided to further enhance gsm in annual phase 2 + releases that incorporate 3G capabilities.

LIMITATIONS IN 1G AND 2G SYSTEMS:-

• No global standards

• No common frequency band

• Low information bit rates

• Low voice quality

• No support of video

• Various categories of systems to meet specific requirements

figure shows the architecture of GSM.

INTERNATIONAL MOBILE TELECOMMUNICATIONS 2000:-

IMT:-A future standard in which a single inexpensive mobile terminal can truly provide communications any time and any where. The main characteristics of 3G systems, known collectively as IMT-2000 are a single family of compatible standards that have following characteristics

• Used world wide

• Used for all mobile applications

• Support both packet witched(PS) and circuit switched(CS) data transmission

• Offer high data transfer rates 2MBPS.

• Offer high spectrum efficiency

IMT standards has made 17 proposals to meet the requirements of 2G systems.The most important IMT-2000 proposals are the UMTS (W-CDMA) as the successor to GSM,CDMA as the interim standard 95(IS 95) successor and time division synchronous(TD-SCDMA), UNIVERSAL WIRELESS COMMUNICATIONS-136(UWC 136/EDGE) as TDMA based enhancements to DAMPS/GSM all of which are leading previous standards toward the

ultimate goal of IMT 2000. The goals of the services to be provided in 3G systems by IMT 200 is shown in figure The Global System for Mobile Communications (GSM) is now the world’s most successful wireless standard. Recent figures indicate that GSM has more than 100 million subscribers in 120 countries and attracts more than five million new users every month. There are nearly 300 GSM system operators worldwide. Current wireless or mobile systems, despite their evolution, are still constrained in terms of the data rate they can offer and their flexibility to manipulate complex, yet user-friendly multimedia services. This need presents the opportunity to the mobile radio, IT, and consumer electronics communities to offer users a mobile system capable of managing and delivering a much wider range of information services to the mass market. Elements of this opportunity include:

• An industry-wide and government commitment across the world;

• A coordinated program including spectrum, standards, and technology; and

• Synergy of communications, IT, and media workings to bring about global opportunities for businesses and consumers, while creating new ways of doing business, entertaining and informing.

A new mobile system for worldwide use is now being developed to enhance and supersede current systems. The Universal Mobile Telecommunications System (UMTS) will be an enhanced digital communications system that will provide universal communications to anyone, regardless of their whereabouts. UMTS will allow for wireless Internet access, video-conferencing, and other bandwidth intensive applications. Benefits from this new system of wireless communications are expected to be:

• Support to existing mobile services and fixed telecommunications services up to 2Mb/s;

• Support to unique mobile services such as navigation, vehicle location, and road traffic information services, which will become increasingly important in world market;

• The ability to enable the use of the system terminal from multiple environments - in the home, the office, and in the public environments -in both rural areas and city centers; and

• Provision of a range of mobile terminals - from a low cost pocket telephone to sophisticated terminals to provide advanced video and data services .

UNIVERSAL MOBILE TELECOMMUNICATION SYSTEMS(UMTS):-

INTRODUCTION:-

In January1998, the European Telecommunications Standards Institute (ETSI) decided on a single air interface standard for the proposed Universal Mobile Telecommunications System (UMTS). The system is one of the major new third-generation mobile systems being developed within the framework that has been defined by the International Telecommunications Union (ITU) and is known as IMT-2000. UMTS has been the subject of intense worldwide efforts on research and development throughout the past decade. The system has the support of many major telecommunications operators and manufacturers because it represents a unique opportunity to create a mass market for highly personalized and user-friendly mobile access to today’s information society. The system seeks to build on and extend the capability of today’s mobile, cordless, and satellite technologies by providing increased capacity and data capability as well as a far greater range of services using an innovative radio access scheme and an enhanced, evolving core network.The system will be a member of a new family of mobile telecommunications systems being developed by the ITU for deployment across the world. While using different radio frequencies in different countries, every system will offer the same set of features to users. This will allow handsets to be developed that can be carried from country to country as the user travels.

The key difference between this system and previous mobile (wireless) systems, such as GSM, is that the earlier systems were conceptually separate from the fixed (wire line) telephone network. The goal of this system is to integrate wire line and wireless systems to provide a universal communications service, such that a user can move from place to place while maintaining access to the sum set of services .

The system is intended to allow users to send and receive data at much higher bandwidths than supported by today’s GSM system. While on the move, users will be able to access remote systems at up to 144Kbps. When stationary, connections of up to 2Mbp/s will be supported through wireless access to networks, with much higher performance being possible by plugging the handset into a network socket .

ETSI has chosen aggressive timescales for the introduction of UMTS in order to meet the demands of customers. The target date for its introduction has been set as the year 2002. figure shows the architecture of UMTS.

To meet the deadline, the ETSI is following a phased approach in hopes of allowing capabilities to improve over time following the initial system introduction. At launch, terrestrial UMTS will have the capability for data rates up to 2Mb/s. However, UMTS is designed as an open system that should allow for evolution to incorporate new technologies as they become standardized.

UMTS CRITICAL TECHNOLOGIES:- Some of the critical technologies essential for the successful introduction of UMTS are described below:

1)UMTS Terrestrial Radio Access (UTRA):-

The ETSI decision in January 1998 on the radio access technique for UMTS combined two technologies. The W-CDMA for paired-spectrum bands and TD-CDMA for unpaired band². The idea was to develop a common standard to ensure an optimum solution for all the different operating environments and service needs .

The transmission rate capability of UTRA will provide at least 144 Kbit/s for full mobility applications in all environments, 384 Kb/s for limited mobility applications in the macro- and micro-cellular environments, and 2.048 Mb/s for low mobility applications particularly in micro-cellular environments. The 2.048 Mb/s rate may also be available for short range or packet applications in the macro-cellular environment, depending on deployment strategies, radio network planning, and spectrum availability.

2)Multi-mode Second Generation/UMTS Terminals:-

UMTS terminals will exist in a world of multiple standards that will enable operators to offer maximum capacity and coverage to their user base by combining UTRA with second- or third-generation standards. Therefore, operators will need terminals that are able to interwork with legacy infrastructures such as GSM/DCS2800 and DECT, as well as other second-generation, worldwide standards (such as those based on the US AMPS standard) because these may initially have more complete coverage than UMTS. Many UMTS terminals will therefore be multi-band and multi-mode. Building such terminals at a cost which is comparable to contemporary single-mode, second-generation terminals will become possible because of technological advances in semiconductor integration, radio architectures, and software radio.

3)Satellite Systems:-

At initial service launch in 2002, the satellite component of UMTS will be able to provide a global coverage capability. Implementation plans call for utilization of the S-band Mobile Satellite Service (MSS) frequency allocations identified for satellite IMT2000 and will provide services compatible with the terrestrial UMTS system .

4)SIM Cards/Smart cards:-

GSM introduced the Subscriber Identity Module (SIM) or Smart Card. SIM technology incorporates enhanced security and a degree of user customization to the mobile terminal. SIM requirements, security algorithms, card and silicon IC technology will continue to evolve up to and during the period of UMTS deployment . The smart card industry anticipates being able to offer cards with greater memory capacity, faster CPU performance, contactless operation, and greater capability for encryption. These advances will allow the UMTS Subscriber Identity Module (USIM) to add to the UMTS service package by providing portable high security data storage and transmission for users. In addition, the users will be able to store, down or upload images, signatures, personal files, fingerprint or other biometrics data through the card. Contactless cards will allow the users to perform business transactions such as electronic commerce or electronic ticketing without having to be removed from a wallet or phone .Electronic commerce and banking activities, utilizing smart cards, is expected to become widespread. Users will expect and be able to use their cards on any terminal over any network. New memory technologies can be expected to increase card memory sizes making larger programs and more data storage feasible. Several applications and service providers could be accommodated on one card. In theory, the users could decide which applications/services they want on their cards, much as they do for their desktop computers’ hard disks .

5)Internet Protocol (IP) Compatibility:-

UMTS is a modular concept that takes advantage of the trend towards convergence of fixed and mobile networks and services, enabling a host of new applications. For example, a laptop with an integrated UMTS communications module becomes a general-purpose communications and computing device for broadband Internet access, voice, video telephony, and conferencing for either mobile, office, or residential use.UMTS may well become the most flexible broadband access technology available, as it allows for mobile, office and residential use in a wide range of public and non-public networks. The system can support both IP and non-IP traffic in a variety of modes including packet circuit switched and virtual circuit². UMTS will be able to benefit from parallel work by the Internet Engineering Task Force (IETF) who is further extending its basic set of IP standards for mobile communication . New developments like IP version 6 allows parameters such as quality of service, bit rate, and bit error rate (BER), vital for mobile operation, to be set by the operator or service provider. Developments on new domain name structures are also taking place. These new structures will increase the usability and flexibility of the system, providing unique addressing for each user, independent of terminal application or location .

6)Cross platform interoperability:-

The need for the ability to transport multimedia content over various types of networks requires industry to develop cross-platform interoperability because the properties of the networks may have an effect on the content of the transmission. In many cases several different kind of networks will be cascaded (i.e. Ethernet, ATM, X.25 and UMTS) .

7)API and Development toolbox:-

It is expected that rapid development and deployment of new and innovative services will drive the UMTS market. A key enabler in this area will be the standardization of the UMTS application-programming interface (API). API allows for abstraction of both the terminal and the network. It will also provide a generic way for applications to access terminals and networks. The API will allow the same application to be used on a wide variety of terminals and will also provide a common method of interfacing applications to UMTS networks. The API will support security, billing, subscriber information, service management, call management, SIM management user interaction and content translation. It is expected that the API will build upon and extend today’s technologies (i.e. Java, Wireless Application Protocol (WAP), GSM SIM Toolkit and Internet technologies) that exploit convergence with other emerging technologies for consumer products (such as digital televisions).

8)Client server architecture:-

One of the primary drivers for UMTS is service differentiation. UMTS allows network operators to market products based on more than just coverage and

capacity issues. The key to this benefit is the ability to develop and offer new products and features in short timescales, without requiring modifications from infrastructure suppliers.

figure shows client server architecture of UMTS.

Many new developments in the IT industry are based on a client/server technology, which allows intelligence to be downloaded transparently from a server into the user’s terminal. The technology provides direct and immediate high performance user interaction and interpretation. On the other hand, tasks that must remain centralized, such as database residence, are held on central servers waiting to rapidly and efficiently respond to queries from the clients. However, in the mobile industry, intelligent terminals and USIM card will allow personalization of the user interface and provision of features not possible with basic terminals in today’s client/server networks. As roaming traffic continues to increase, the ability to provide such features independently of the serving network will become increasingly important. Existing and evolving GSM standards, such as SIM Toolkit and Mobile Execution Environment, together with other initiatives such as WAP, provide the framework for delivering this enhanced client/server approach. The user of an object-oriented language such as Java is attractive because it is platform and operating system independent, and optimizes the download .

9)Customer Care and Billing Systems:-

UMTS will operate in a very different environment than today’s mobile systems. Customer care and billing are inextricably linked. These systems must be able to effectively operate with all UMTS users and providers in a customer-friendly manner. For UMTS, a bill will no longer be just a dun but, instead, a key part of a highly sophisticated approach to customer care across all provider services. Convergence will not only require the interoperation of fixed, mobile, satellite, private and public systems but also the integration of players from non-telecommunications fields such as finance, entertainment, and the news media. This will require a harmonized solution to customer care and billing systems despite very different legacy practices.

The competitive services market will demand multiple flexible interconnections between players and roles. Seamless delivery will require a unification of management and a means to provide interworking without a prior relationship. Significantly higher levels of automation and timeliness will be required to support the billing and customer care operations. In addition, fraud management will need to be applied across the whole value chain. Charging and billing will need to mature as concepts and practices.

BENEFITS OF UMTS: what it offers?:-

Corporate use of UMTS (including global mobile access to Intranets) will be a key driver for UMTS. Businesses will demand greater flexibility for customization and more devolved service control to optimize productivity and operational efficiencies within corporate networks. UMTS subscriber and network management capabilities will offer enhanced capabilities to meet these new and evolving requirements .

The body of literature on UMTS indicates that it offers the promise of being a significant advancement in mobile communications technology. UMTS is being designed to ensure flexibility is presented to users, network operators and service developers. UMTS will offer significant benefits in communication abilities including:

• Ease of use and low cost;

• New and better services;

• Packet transmission and data rates on demand; and

• Improved mobility and coverage.

1)Ease of use and low costs:- Wireless customers want useful services, easy-to-use terminals and good value for money, UMTS is envisioned to offer services that are easy to use and customizable in order to address individual user needs and preferences. Terminals and other customized equipment will be available to allow easy access to these services. A wide array of inexpensive, available terminals and other periphery will be available. Costs for the actual UMTS service are projected to be low enough to ensure a mass market and provider competition.

2)New and better services:- Market studies show that voice will remain the dominant service for existing fixed and mobile telephone networks, including GSM, through 2005. Users will demand low-cost, high-quality voice service from UMTS. However, the opportunity for increased revenues through UMTS comes from offering advanced data and information services. Long term, industry forecasts for UMTS show a strongly growing multimedia subscriber base by the year 2010.

3)Fast access:- One factor, which clearly sets UMTS above the second-generation mobile systems, is its potential to support 2Mb/s data rates for users from the outset. This capability, together with inherent Internet Protocol (IP) support of UMTS, is a powerful combination to deliver interactive multimedia services as well as other new wideband applications such as video telephony and video conferencing.

As the demand for user data rates increases in the long term, UMTS will be developed to support even higher data rates, perhaps one or two orders of magnitude greater. In later phases of UMTS development, there will be a convergence with even higher data rate systems using mobile wireless Local Area Network (LAN) technologies (microwave or infrared) providing data rates of for example 155 Mb/s in indoor environments .

4)Packet transmission and data rate on demand.:-Most cellular systems in use today use circuit-switched technology for wireless data transmission. However, UMTS integrates packet and circuit data transmission. Packet data over the airwaves provides the user several benefits:

• Virtual connectivity to the network at all times;

• Alternative ways of billing. For example, pay-per-bit, per session or flat rate per month; and

• Asymmetric bandwidth in the uplink and downlink. As demanded by many emerging data services where one link direction carries simple commands and the other carries and content rich, bandwidth intensive traffic (for example Web browsing or video transmission).

UMTS is also being designed to offer data rate on demand, where the network reacts flexibly to a user’s demands based upon his or her profile and the current status of the network. The use of packet-oriented transport protocols such as Internet Protocol (IP) for UMTS is being studied now. The combination of packet data and data rate on demand will remove technical barriers for the user and make operation of the system much cheaper. Simply put, there should be no worries about how and when to connect to the network.

UMTS services are based on standardized service capabilities, which are common throughout all UMTS user and radio environments. This means that a user will experience a consistent set of services even when he or she roams from his or her home network to other UMTS operators. Users will find the same interface, whether they are in their home network or roaming. The Virtual Home Environment (VHE) will ensure the delivery of the service provider’s total environment, including for example, a corporate user’s virtual work environment, independent of the user’s location or mode of access (satellite or terrestrial).

VHE will also enable terminals to negotiate functionality with the visited network, possibly even downloading software so that it will provide “home- like” service. The ultimate goal is that all networks, signaling, connection, registration and any other technology should be transparent to the user so that mobile multimedia services are simple, user friendly and effective.

Mobility and Coverage:- UMTS has been designed from the outset to be a global system, comprising both national terrestrial and global satellite components. Through multi-mode, multi-band terminals it can use 2nd generation systems to extend its coverage for basic services. The overall goal of the system offering is to achieve truly personal communications using terminals that are able to roam from a private cordless or fixed network (Figure 1). A second goal is to achieve this with a consistent delivery of the services via VHE.

Figure 1. UMTS Coverage is Universal (Leino, 1999).

The UMTS radio access system UTRA will support operation with high spectral efficiency and service quality in all the physical environments in which wireless and mobile communication take place. Today’s users live in a multi-dimensional world, moving between indoor, outdoor urban and outdoor rural environments with a degree of mobility ranging from stationary through pedestrian up to very high vehicular speeds. There are also different user density environments, including three-dimensional situations in high-rise buildings. UTRA has been specified for all these environments.

Limitations of UMTS:-

In practical implementations of UMTS, some users may be unable to access the highest data rates at all times. For example, the physical constraints of radio propagation and the economics of operating a network will mean that the system services might only support lower data rates in remote or heavily congested areas. Therefore, in order to ensure that the subscriber is always able to use their terminal, services will be adaptive to different data rate availability and other Quality of Service parameters.

In the early stages of UMTS deployment, traffic will probably be generated predominantly in locations such as airports and railway stations which operators will cover immediately following network launch. However, users will want full coverage so that they can access their services wherever they are . To offer this, UMTS technology is being defined to enable roaming with other networks. For example a GSM system operated by the same operator or alternatively by roaming agreements with other networks such as other GSM based systems or other third generation systems including UMTS compatible satellite networks, which will effectively be able to offer global coverage.

The limitations are,

1)Risk of further regulation:- There is a certain anxiety that an attempt to achieve circulation by means of administrative measures may lead to heavier regulation of UMTS (e.g. in the form of complicated procedures or excessive marking). Therefore, current efforts are intended to take care to aim to simplify regulation in all circulation measures.

2)Standardization:- Standardization will remain a key factor in providing quality services at an affordable cost and enabling roaming between systems. The success of UMTS depends upon the flexibility of interfaces and the capacity to evolve in parallel with technological development. Continued close co-operation between operators, manufacturers and regulators in the standardization of UMTS/IMT 2000 is crucial for successful harmonization of standardization proposals.

UMTS in the Long Term:-

In order to ensure that UMTS flourishes in the long term, its capabilities must be progressively increased by the addition of new technologies. These technologies are discussed below.

1)Re-configurable Terminals:- UMTS terminals will have to exist in a world of multiple standards, both second-generation standards and other members of the IMT-2000 family. In order to provide universal coverage, seamless roaming and non standardized services will no longer have fixed parameters, rather they will be in the form of a “toolbox” whereby the key parameters can be selected or negotiated to match the requirements of the local radio channel.

In addition to the capability to adapt to different standards as described above, terminals will enable network operators to distribute new communications software via download over the air in order to improve the terminals’ performance in the network or to fix minor problems (e.g. an improved handover algorithm). This aspect of software downloads will generally be invisible to the user.

2)Application and Service Download:- When using today’s multimedia terminals (e.g. PCs), users have accepted the idea that the capabilities of the terminal can be modified over time through a software download. It is now commonplace for a user to download a new “plug in” (for example a video or audio code) to access new types of content. The introduction of multimedia services on UMTS will take this concept into the mobile domain. UMTS “plug ins” will come from a variety of sources, for example:

• Pre-installed on the users’ terminal by the network operator or service provider;

• Downloaded over the air, at the user’s request or automatically by the network - much as today, where many Internet service providers upgrade one’s software or databases during a session; and

• Supplied on media such as DVD or CD-ROM.

Smart Antennas:- Smart antennas react intelligently to the received radio signal, continually modifying their parameters to optimize the transmitted and received signal. This allows them to:

• Increase coverage and capacity by reducing interference between adjacent mobiles;

• Offer space division multiple access, where frequencies are assigned on a per-mobile rather than a per-cell basis allowing vastly increased capacity; and

• Enable user location in space, allowing the introduction of advanced location based services.

Broadband Satellite Systems:- Several broadband satellite systems are also planned for deployment in the post-2002 timeframe to offer data rates beyond 2Mb/s and into the Gigabits domain. Some of these systems may offer compatibility with UMTS service concepts using satellite frequency allocations in the 20-30 GHz range. The requirements of the terminal equipment and higher power consumption will necessitate larger size transportable or fixed terminals or smaller electronic components.

CONCLUSIONS:-

UMTS appears to offer significant benefits to personal and commercial endeavors. Technologies are being put in place to bring it into the mobile community. A phased introduction of UMTS hardware and services with coverage, capability and number of operators growing over time. This phased introduction ensures early availability of services to users while reducing risks for UMTS operators and manufacturers.

UMTS must be capable of co-existing and working with existing second-generation mobile communications technologies so that operators can choose to reuse their existing infrastructure assets and expertise. Global availability of UMTS servers will be ensured by providing for roaming between members of the IMT-2000 family and handover between GSM and UMTS. A number of technologies are required, in addition to the radio interface on which so much focus has been placed recently. Although most current attention is focused on the early years of deployment, UMTS is being defined with a view to the long term.

UMTS is a significant opportunity for manufacturers, operators, and content providers as a communications system and as a part of the greater information society. The vision of UMTS is as a customer-focused system, where customers include both network operators and end users. The challenge to the communications industry is to integrate the technologies needed for UMTS in a way which supports this goal and thereby transforms the vision for UMTS into reality.



MENDIBLES

David Boon asked:


Mobile phone offers make customers delighted as most of the offers are meant for the customers’ benefit. Mobile phone offers bring revenue to the network service providers and bring some exciting things to the customers too.

Mobile phones is a fundamental tool for a hassle-free communication in today’s fast-paced life. In the earlier days, mobile phones were just meant for communication,i.e., one is for making and receiving calls and another one is to sending and receiving messages. During these times, mobiles were meant only for verbal and non-verbal communication. With the advancement of technology, manufacturers are now coming up with mobiles loaded with numerous specifications and amazing features. Mobile manufacturers are extending their businesses with improved and new services to a large number of people. This way, if any of the mobile phone manufacturers is successful in attracting the attention of their prospective customers, he can easily be recognised as one of the leading companies in the mobile phone industry.

Keeping the genre in their minds (to produce ache functionality mobile phones), the mobile manufacturing companies are introducing mobile phones with exciting features and functionalities. Some of the sought-after mobile phone companies such as Nokia, Samsung, LG, Motorola and Sony Ericsson are all putting up their efforts to please the demands and desires of the modern day mobile phone users.

We already know that the mobile phone have taken all the attention as this tiny gadget has become one of the basic needs of most of the people. With it, a large number of mobile phone retailers have entered into the market. Every network service provider wants to survive in this competitive world and also wants to make a mark in the market. This is the reason why every provider is offering different types of mobile phone offers to the customers on purchasing mobile phones from his store.

Every mobile phone user of this time wants to get the modern mobile handset in his pocket to enjoy all types of comforts and entertainment features. In addition to that, the common man is expecting latest mobile handsets at affordable prices. To reach the maximum number of people and to maintain these modern handsets at very low prices, the retailers are offering various types of deals such as-Contract deals, pay as you go phones, Sim Free Phones , 12 months, 18 months and 24 months monthly rental plans. Many of the retailers are even offering free talktime and text messages to make few things easier for the users.

As we have the idea that there are numerous offers and discounts with the mobile phone offers that are provided by the retailers like Free Gifts with Mobile Phones of gaming consoles (gaming consoles like Sony PSP, Xbox 360, or Nintendo)music player, iPods, LCD TVs, Laptops and mobile phone at the cost of one price. These all surprising gifts and offers are available with the most innovative mobile phones that come up with all the world class features and entertainment specifications. That’s why, the present day mobile phone market is flooded with different styles of phones with various features. Users have all the liberty to choose the best one that can easily suit their needs. Those who are music lovers can go for a phone which comes with built-in high-quality music player and FM Radio. We can see now that all the modern gadgets are coming with digital camera features that help the users to capture the memorable moments of their life.

Mobile phone offers brought a huge number of revenues in the pockets of service providers as well as in the mobile phone manufacturers. Contrary to that, the network service providers are equally important because good network service providers that provide mobile phone offers to the users in the UK market such as O2, Orange, T-Mobile, 3 and Virgin are desired by one and all.



VASSALLO

Kelly Devon asked:


 

Mobile phones are the most essential elements in modern people’s life. As the latest mobile phones allow users to access lots of advanced multimedia and business functionaries along with communication purpose, more people are going for the latest mobile phones for the intention of availing a multi-purpose gadget. But in this expensive environment, people are always searching for the best deal available. When it comes to mobile phones the scenario is also same.

In this digital era, Internet has become the most preferable medium to the people all around the world. Various companies are choosing this medium to reach their products to the mass audience. Over there you will find various online shopping portals which offer numerous models from all the top brands of mobile phones. By going for these online shopping portals you will also get the advantage to compare the price and features of a particular mobile phone with other models of different brands.

To survive in this cut-throat competition of the market, the online shopping portals are coming with various lucrative mobile phone offers. Different shopping websites offer different offers. These offers attract customers towards them and people do prefer those portals which offer them the best mobile phone deal with lucrative offers.

Now almost all the mobile phone service providers offer several kind of mobile phone deals to induce customers. Some of the most popular deals include cash back offers, free line rentals, contract mobile phone deals and so on. Along with these deal you will get the various attractive offers like LCD TVs, high-tech gaming consoles like Nintendo Wii, laptops etc. These gifts are nothing but one of the promotional strategy that are being adopted by the mobile phone retailers to promote their sell and the name of their websites.

Mobile phones with free gifts have become highly popular among the customers. Actually,the word ‘free gifts’ always attracts customers towards a deal. That’s why the the mobile phone network companies are adopting these tactics to attract the customers. The scenario becomes so that, to the customers it becomes almost difficult to think of availing a mobile phone deal without any free gift. That’s why it has been seen that customers are mostly preferring to go for the Online deals instead of the normal mobile shops.

Actually, these kind of free gifts strategies are becoming highly popular among the people all round the world these days. A perfect combination of the highly fashionable and world-class feature-rich mobile handset with exciting offers and incentives attracts anybody in the world. One other reason behind popularity of these kind of offers is these hypnotise and fascinate enabling them to make the purchase cost-effective. If makes a comparison among the pieces, deals and other offers with the normal mobile phone shops quite easy due to which will allow them to know that the Online mobile phone merchants are offering the best deals and offers among all the type of retailers.

Now almost all the online mobile phone merchants are coming with numerous high-end gadgets with different deals and gifts. That’s why the expensive models have become quite affordable. In this age no one would resist these kind of offers at a affordable prices. For example we can say of a mobile phone customer who is getting an Nintendo Wii gaming console with a mobile phone, would definitely like to go for the deal. As a result, the sales figure of mobile phones through the online shopping portals is increasing day-by-day and ultimately both the retailers and customers are benefiting from this way of mobile phone sales.

You can avail the best mobile phone offers with all the top networks, which include like Virgin, O2, Orange, T-Mobile, 3, Vodafone etc. With all these mobile phones you will get several lucrative offers that will definitely enrich your enjoyment of shopping your dream mobile phone.



GASTON

Adam Jaylin asked:


Latest mobile phones are best classified as those mobile phones which are truly made for people who love to use user-friendly and hassle-free handsets. These handsets not only come embedded with advanced technologies into it but these kinds of handsets are also quite reasonable in price.

Communication is the biggest thing in this fast-paced life style and for this mobile phones have taken an important role for good and hassle-free communication. Mobile phones are important commodities for every one. Without this small gadget, life would become difficult as it helps us to communicate with people with whom we want to communicate. This tiny gadget, which is known by the name, mobile phone, has really do not have any other substitute as this electronic device is the only medium for communication and interaction throughout the world without having any kind of obligations.

Mobile phones influenced our life to a great extent and give us a new dimension to the communication needs. High-end technologies have brought various kinds of changes and innovations which have been undergoing the process of modification and up gradation. Earlier, people used to talk over the landline phones because this was the time when these phones were the sole means of telecommunication. But time has been changed since then the materialistic world wanted to assimilate the face of communication and thus mobile phones came into existence.

The one biggest advantage of a mobile phone is that it is wireless and for this it is called mobile, it can be carried out to anywhere, any place, any moment. Earlier, when people used to talk over landlines (which are installed in households or in some place), it was typically wired with a telephone cord and sometimes, it would become difficult to change its place as it has to be placed somewhere because it cannot be able to move wherever and whenever we wish. That’s why, today’s mobile phones give us a opportunity to communicate in hassle-free manner. For that, most of the people across the world are using mobile phones(also called as cell phones) as a major means of communication . Mobile phones made communication so easy especially latest mobile phones are made in such a manner which gives utmost satisfaction to the users.

The latest mobile phones have all sorts of functionalities and specifications which have not only increased the efficiency in communication but have also become a powerful tool having the capability to perform various kinds of tasks within a short span of time. These mobile phones have been going through some vast developmental phase and the ultra new phones have actuated a sense of freshness into it. The ultra new phones have been designed and endorsed by the high-end technology and these latest mobile phones technology and their popularity is a great sign of their achievement in the mobile market. This latest technology mobile handsets are the perfect entertainment tools as these ultra-finish phones are equipped with high-end specifications and characteristics for smart mobile usage and even amusement.

Mobile phone companies are producing mobile phones or handsets with different varieties and qualities, these companies never stop manufacturing with their latest models of mobile phones. There are number of brands flocked in the market like - Nokia, Samsung, Motorola, Sony Ericsson, BlackBerry, LG mobiles etc. These standard brands are just trying to produce and develop latest brands with latest high-end features.

The recently released mobile phones are completely loaded with a high functionality camera which will never down any one with its performance or tasks.

The latest mobile phones has everything into it. The ultimate stylish skilled camera has the capability to click flawless pictures which can be admire forever. Any one can get a camera mobile phone between the range of 1.3 mega pixels to 8 mega pixels. These types of phones have all kinds of latest features such as autofocus, flash, image stabiliser, photo editor, video streaming, video editing, video white balancing and CMOS Sensor etc. to name a few.

The latest mobile phones are having ultra new methods for messaging like-SMS(Short Message Service) for text messages, MMS(Multimedia Messages) for illustrated messages, instant messaging option, Email(POP, IMAP and SMTP), Email with attachments, text to speech message reader and distribution list. The above mentioned specifications are seen in the Nokia N series handsets.

This Nokia N series sets are just the class apart, these kinds of phones are master pieces from the house of Nokia group. All of its N series handsets are having the best connectivity functionalities, they have- 3G HSDPA option along with USB cable port, Infrared, Bluetooth, WLAN Wi-Fi, HSCSD, GPRS and EDGE.

All these latest technology mobile phones are not only having the classy effect but these latest technology handsets are reasonably priced so that every average man can afford the latest mobile handset for them, not only for style or having a gorgeous expensive handset but for its utilities and classy effect.



PORTLOCK

John Daniel123 asked:


Mobile phones are not only a communicating instrument but also a fashion icon as well as a status symbol. Latest and full of newborn technology mobile phones are the essential part of everyone’s life. Therefore many mobile phone manufacturers have come in the mobile phone market but no other mobile phone manufacturer is so much popular as Nokia. This Finnish mobile giant has changed the method of mobile manufacturing. All the latest ad newborn technologies are available in the Nokia mobile phones. In other words, Nokia, the renowned Finnish mobile manufacturer is always known for giving the best phones with latest technologies. Nokia’s N-series mobile phones are just another achievement added to the glorious tradition of Nokia’s perfection. The recently introduced Nokia mobile phones are another noteworthy output initiated by incessant outpouring of newer technologies. The upcoming of newer technologies are really inspiring the mobile manufacturers like Nokia, Motorola, Samsung and LG to apply their expertise and knowledge to bring out phones with more enriched features. Nokia mobile phones of the N-series, the mobile phones are just superb highlighting 2-megapixel cameras, swiveling bodies and models with iPod-like music storage. The eldest of the Nokia N-series mobile phone the Nokia N70 is tiny and lightweight phone with 3G-capablities, 2-megapixel camera which can really add a zing to the life. Another member of the Nokia mobile phones the Nokia N90 is also loaded with a 2-megapixel capability that allows photography with great clarity. The screen of the Nokia mobile phone, N70 can be twisted and flipped to enable different shooting perspectives and also it allows video capture. The Nokia mobile phones are perhaps the most sought-after mobile phones in the market. On the top of the Nokia mobile phones, the Nokia N91 is another evidence of the exceptionalness of Nokia mobile phones. With excellent music capabilities, integrated 4GB of memory Nokia N70 is another Nokia mobile phone which deserves wide appreciation. The Nokia N95, featuring a music player, visual radio, document viewer, Internet browsers and 5.0 megapixel camera is another Nokia mobile phone born to rule the mobile world. This two-way sliding Nokia mobile phone supports Quad Band technology and thus gives a refined feeling to the world of connectivity.  Above all these mobile phones Nokia N95 8GB is the latest search in N Series of Nokia. Nokia mobile phones are just second to none, with superlative technology and innovative designs. Perhaps Nokia Mobile phones are all-time favorites any mobile phone user would love to possess. A pioneer in mobile telephony in various respects Nokia mobile phones such as Nokia 6280, Nokia 6233, and Nokia 6234 come with features and functionalities fit for all purpose and all class of mobile phone users. Whether in style or service, functionality or application, Nokia mobile phones can easily surpass any other brands in the market. Small, sleek and shiny Nokia handsets easily attract the attention of any onlooker. Having one in your hand you must be proud of. There are different deal of mobile phones as pay as you go, contract deal pay monthly mobile phones and many others. You are to search over internet and select the right dealer according to your requirements and any kind of Nokia mobile phone will be in your fist.



HENSEL

Steve Thomas asked:


Nowadays, it is compulsory to a cell phone to keep in touch with your known. Mobile phone user who talks a lot are very upset with there high expenses on the monthly bills. If you are looking for a mobile phone contracts with affordable and cheap schemes to assuage your pocket, then try to take care of your communication needs then you can give a thought to contract mobile phones. Cheap mobile phone contracts offers expel liberty to the users to select the contract mobile phones deal according to their suitability. If you search online you can easily get affordable contract mobile phones at discounted prices from online mobile phone companies. The most important thing while choosing contract mobile phones are the time period of the contract and its consecutive price!

 The booster of mobile phones contract is that you have to enter in to contract mobile phones deal for a limited time period. In the contract mobile phones plan you will gain a lot of benefits like free texts, incentives, free minutes, lower calling rates, free mobile phone handset insurance, free mobile phone accessories and many more. This inculpates some courtesy to your calling prototypes and you can easily get the satisfactory contract mobile phones for your individual necessities. For me, the best thing is that users need not have to sacrifice their pick over the range of handsets, as contract mobile phones are standardized with any mobile phone handset. As a result, without additional expenses you can also get mobile accessories like: Bluetooth wireless connectivity, music player, GPRS, USB, Mega pixel camera and many more…

 Search through internet surfing, you will get the best possible contract mobile phones with most trendy handsets. Mobile phones contracts expedite you to experience cutting-edge gadgets at its best without expanding your money. On the web, you will find contract mobile phones on almost all latest handsets that can be very easy to find an affordable tariff plan on any contract mobile phones. Online mobile shops primarily distillate on trendy handsets, network providers and special free gifts offer with such mobile phone contracts. From all the paying, mobile phones contract, the most striking contract are the contract mobile phones tariffs, Pay as you go mobile phone contract and sim free mobile phone contracts. What makes these contract mobile phones more eye-catching is that one can find these mobile phone contracts on all the latest handsets brazen in the marketplace.

 The trend of mobile phones is escalating extremely. The UK mobile phone marketplace is bursting with abundant of mobile phone contracts offering various discount services. Looking back, there are many online mobile phone companies who are providing the same handset class but the thing that you have to seek for now is what manufacturer you can truly get a contract mobile phones. It is always very entangling for the mobile phone users, when it comes to choosing the best mobile phone contracts tariff plan. Presently, with so much race, the mobile phone users are getting wonderful advantageous from the network service providers and the online shops.



MAULE

Steve Thomas asked:


In today’s life, it is become a necessity to have a mobile phone. 90% of mobile phone users are disappointed with their high mobile phone bills. If you are seeking for a mobile phone contracts to palliate your money, yet take care of your interaction requirements then you can give a thought to mobile phone contract. Such incredible contract mobile phones propose complete freedom to the mobile phone users to choose for a mobile phone contract which suits them. You can find mobile phone contract deals at competitive prices from online mobile phone shops. What the main thing is to know about mobile phones contracts.

The catalyst of contract mobile phones is that you have to enter in to mobile phone contract for a particular timeframe. In between this time, you will get a lot of advantageous like free texts, free minutes, lower calling rates, incentives, free mobile phone accessories, free mobile phone handset insurance and so on. This entails a little attention to your calling prototypes and you can simply get the right contract mobile phone for your particular requirements. The best part is doing not have to compromise over your selection of handsets, as mobile phones contracts are consistent with any mobile phone handset. Consequently, you can make most of the advanced features like GPRS, Bluetooth wireless connectivity, USB, Mega pixel camera, music player and so on. An online search is advised to get the best possible mobile phone contract tariff plan for your handsets. Mobile phones contract facilitate you to experience latest tools at its best without letting it pinch your pocket.

Online you will find contract mobile phones on almost all trendy phones that can be very easy to find a cheap tariff plan on any contract mobile phones. Online mobile companies basically concentrate on latest handsets, service providers and special free gifts with such mobile phone contracts. From all the remunerative contract mobile phones, the most eye-catching contract are the contract mobile phone deals, Pay as you go mobile phone contract and sim free mobile phone contracts. What makes these deals more alluring is that one can find these mobile phone contracts on all the new handsets ostentations in the market.

To start with, contract mobile phone tariffs are referred the best contact phone, as with this scheme, the person enters into a deal with a specific network service provider. This contract consists of tariff which can be a 12 months rental plan or an 18 months rental plan.



SZADY