AMPS: stands for Advanced Mobile Phone Service. Analog cell system.
TDMA: stands for Time Division Multiple Access. It works by dividing the spectrum into frequency channels and each user uses each channel for a specific time, to avoid interference.
CDMA 1XRTT: Second generation technology (2.5G, actually) which allows data transfers up to 144 Kbps.
EDGE: stands for Enhanced Data Rates for Global Evolution. Technology promoted by GSM operators. Before migrating to WCDMA, EDGE will allow third generation data and voice access with 384 kbps transfer rate.
EV-DO: Third generation (3G) from CDMA 1xEV-DO technology. "EV" comes from and "DO" from data-only. It uses a second channel, of 1.25 MHz, exclusively for data transmission. Some countries are already running this standard. In the USA, Verizon and Sprint started this technology in 2004. This tecnology allows hi-speed Internet access (2.4 Mbps) using the cell phone or using a wireless connection from a laptop or PDA.
EV-DV: Evolution of EV-DO, but still under development. "DV" comes from data-and-voice. It uses the same channel for trasmiting data and voice. The transfer rate can reach 5.2 Mbps.
WCDMA: Wideband CDMA. Third generation technology that will be adopted by GSM operators. Its European version is known as UMTS (Universal Mobile Telecommunications System). It can reach transfer rates up to 2 Mbps.
