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GSM Phone

What is GSM?       What is a SIM card?

 

What is GSM?

GSM (Global System for Mobile Communications) is a second-generation digital mobile telephone standard using a variation of Time Division Multiple Access (TDMA). It is the most widely used of the three digital wireless telephone technologies - CDMA (Code Division Multiple Access), GSM and TDMA. GSM digitizes and compresses voice data, then sends it down a channel with two other streams of user data, each in its own time slot. It operates at either the 900, 1800 or 1,900MHz frequency bands.

GSM was initially developed as a pan-European collaboration, intended to enable mobile roaming between member countries. As of March 2003, GSM digital wireless services were offered in some form in over 193 countries. In June 2002, about 69% of all digital mobile subscriptions in the world used GSM phones on GSM networks.

What is a SIM card?

The SIM - Subscriber Identity Module - is a chip card, the size of a first class postage stamp. It is a key element in over 600 million GSM (Global System for Mobile) mobile phones - representing about 70 percent of the mobile handset market.

A SIM is actually a tiny computer chip that gives a cellular device it's unique phone number. It has memory (for data and applications), a processor and the ability to interact with the user. Current SIMs typically have 16 to 64 kb of memory, which provides plenty of room for storing hundreds of personal phone numbers, text messages and other data.

 

 

 

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