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GSM Mobile Phones
GGSM has been the backbone of the phenomenal success in mobile telecoms over the last decade. Now, at the dawn of the era of true broadband services, GSM continues to evolve to meet new demands. One of GSM's great strengths is its international roaming capability, giving consumers a seamless service in about 160 countries. This has been a vital driver in growth, with around 300 million GSM subscribers currently in Europe and Asia. In the Americas, today's 7 million subscribers are set to grow rapidly, with market potential of 500 million in population, due to the introduction of GSM 800, which allows operators using the 800 MHz band to have access to GSM technology too.

What is a SIM card?
GSM phones require a small electronic chip, called a SIM card, to be inserted into a slot in the handset. This SIM card is the "heart" of the phone - it contains your mobile phone number, your phone book, and all of your registration information.

How do I put the SIM card into the phone?
This will depend on the type of phone you own. Usually, the SIM is located behind the battery, and will slide straight out. Ensure you put the new SIM in the right way, with the information panel on the card (the golden part) touching the metal connectors in the phone. If you still have problems, consult your phone's manual, which should have instructions on entering SIM cards.

What is technically distinctive about the technology?
GSM differs from first generation wireless systems in that it uses digital technology and time division multiple access transmission methods. Voice is digitally encoded via a unique encoder, which emulates the characteristics of human speech. This method of transmission permits a very efficient data rate/information content ratio.

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The Wireless Evolution is achieved through the GSM family of wireless technology platforms - today's GSM, GPRS, EDGE & 3GSM. GSM is a living, evolving standard - growing and adapting to meet changing customer needs. It is the basis of a powerful family of platforms for the future - providing a direct link into next generation solutions including GPRS (General Packet Radio Services) EDGE (Enhanced Data for GSM Evolution) and 3GSM.

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