The International Mobile Telecommunications 2000 is a family of standards for wireless communications defined by the International Telecommunication Union (ITU), which includes GSM EDGE, UMTS, and CDMA2000 as well as DECT and WiMAX. This is better known as 3G or 3rd Generation. The 3G Services include wide-area wireless voice telephone, video calls, and wireless data. 3G allows simultaneous use of speech and data services and higher data rates.
The standards in 3G includes CDMA2000, WiMAX (Worldwide Interoperability for Microwave Access), DECT (Digital Enhanced Cordless Telecommunications), W-CDMA (Wideband Code Division Multiple Access), UMB (Ultra Mobile Broadband), and EV-DO (Evolution-Data Optimized or Evolution-Data only)