The Global System for Mobile communications is a digital cellular communications system. GSM standards are used to provide the interface between the various entities in GSM network. GSM networks presently operate in three different frequency ranges,
GSM 900 (operates in the 900 MHz frequency range and is the most common in Europe and rest of the world), GSM 1800 or DCS 1800 (operates in the 1800 MHz frequency range and is found in a rapidly-increasing number of countries including India, France, Germany, Switzerland, the UK, and Russia) PCS 1900 or DCS 1900 - the only frequency used in the United States and Canada for GSM).
GSM 900 (operates in the 900 MHz frequency range and is the most common in Europe and rest of the world), GSM 1800 or DCS 1800 (operates in the 1800 MHz frequency range and is found in a rapidly-increasing number of countries including India, France, Germany, Switzerland, the UK, and Russia) PCS 1900 or DCS 1900 - the only frequency used in the United States and Canada for GSM).
Between these only differences, so far seem to be the power levels, frequency & some small changes in signaling.
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