Third-Generation Cellular services - At the time of this writing, vendors are just beginning to activate third-generation networks for commercial purposes. Many sources say that 3G will be the wireless-networking technology of the future, offering data rates high enough for mobile users to work with multimedia Web content, videoconferencing, and e-commerce. 3G is fast, in part, because it uses a 5-MHz-wide carrier signal, rather than the 200-KHz-wide carrier that narrowband CDMA uses. Technologies used in 3G communications include W-CDMA, CDMA2000, TD-CDMA.