1G The first generation began in the early 80s with the commercial deployment of advanced mobile phone service cellular networks. The disadvantage and reason for move into digital systems is only one subscriber at any given time is assigned to a channel.2G the second generation emerged in the 90s when mobile operators deployed two competing digital voice standards (GSM and CDMA). In Voice and SMS sent through control channels meant for communication between tower and handset. Greater throughput is achieved through digital techniques such ad compression and modulation.
2G+ through 2.5G and 2.75G operators tried to introduce data services. In GSM, GPRS peak rate is 114 kbps and EDGE peak rate is 384 kbps are available. In CDMA 1xRTT peak rate is 144 kbps, if you use more voice, you get less data.
3G 5MHz multi-carrier system is used in 3G so that voice and data can be accommodated in the same channel. Data transfer rates can go up to several Mbps.
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