1G First generation wireless : analog cellphones. 1xRTT CDMA Specifically,1xRTT (otherwise known as 3G 1x) represents one times radio transmission technology with 1.25 MHz channels. This technology supports peak data speeds up to 144 kbps, and up to a doubling of voice capacity.
3G Stands for “third generation” or “3rd generation”, generally applied to wideband mobile services and applications.
3GPP Third Generation Partnership Project, set up to expedite the development of open globally-accepted technical specifications for 3G.