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GSM (Global System for Mobile) is a digital cellular radio network used in over 200 countries worldwide. It is the dominant standard in Western Europe with nearly complete coverage and is growing in the Americas, Asia and other areas too.

GSM uses three frequency bands.

GSM 900 - operates in the 900 MHz frequency range and is the most common in Europe and most of the world.
GSM 1800 - operates in the 1800 MHz frequency range and is found in a growing number of countries already using GSM 900.
GSM 1900 (also called PCS (Personal Communication Services) 1900) - is used in the United States and Canada.

A significant feature of GSM is roaming; this allows cellular subscribers to use their services in any GSM service area in the world in which their provider has a roaming agreement.

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