GSM is a digital mobile telephony system with widespread use in Europe and other parts of the world. The acronym GSM stands for Global System for Mobile communication. GSM uses a variation of time division multiple access (TDMA) and is the most popular when compared to usage among the three digital wireless telephony technologies (TDMA, GSM, and CDMA). GSM digitizes and compresses data, then sends it with two other streams of user data, each in its own time slot. It operates at a frequency band of 850, 900, 1800 or 1900 MHz depending on the country/region.
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