3G

[Packet - based]

• Wideband Code Division Multiple Access (W-CDMA)
• CDMA 2000

2.5G

[Packet - based]

• CDMAOne
• General Packet Radio Service (GPRS)
• Enhanced Data Rates for Global Evolution (EDGE)

2G

[Circuit - switched]

• Time Division Multiple Access (TDMA)
• Code Division Multiple Access (CDMA)
• Global System for Mobile Communications (GSM)
• High-Speed Circuit-Switched Data (HSCSD)