CDMA: Code Division Multiple Access. Voice carrier technology used by Verizon Wireless and Sprint PCS/Nextel.
CDMA2000 1xEV-DO: Evolution-Data Optimized. 3G High Speed data technology (Sprint/Nextel and Verizon Wireless).
EDGE: Enhanced Datarate for Global Evolution. 2.75G technology that provides up to 237 Kbps data downloads and 184 Kbps uploads, offered by Cingular and T-Mobile.
GPRS: General Packet Radio Service. 2.5G technology that provides up to 40 Kbps data (Cingular and T-Mobile).
GSM: Global System for Mobile Communications. Voice carrier technology used by Cingular, T-Mobile, and most European providers.
HSDPA: High-Speed Downlink Packet Access. 3G technology allows 400 to 700 Kbps data rates, offered by Cingular.
1xRTT: 1x Radio Transmission Technology. 2.5G technology that provides up to 60 Kbps data speeds (Verizon Wireless), and up to 144 Kbps (Sprint PCS Vision).
SIM: Subscriber Identity Module. Card used in most GSM-compatible phones to store subscriber account information, plus contacts and other data.
3G: Third Generation. Provides up to 2 Mbps downloads in a stationary position.
UMTS: Universal Mobile Telecommunications System. 3G data network with up to 384 Kbps data rates (stationary).