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2G networks (GSM, CDMAOne, D-AMPS) are the first digital cellular systems launched early 1990s. 3G networks (UMTS FDD and TDD, CDMA2000 1x EVDO, CDMA2000 3x, TD-SCDMA, Arib WCDMA, EDGE, IMT-2000 DECT) are newer cellular networks that came to the U.S. around 2003 with data rates of 384kbit/s up to 2-3 Mbits/s.
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2g is slow where as 3 is very fast
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