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2G: In the realm of cell phones, 2G refers to the second-generation wireless digital telephone technology. 2G cell-phone networks uses 3 common technologies to transmit information; they are Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA) and Code Division Multiple Access (CDMA).
3G: 3G supersedes 2g as the third generation of mobile communications systems. It enhances services like multimedia, high speed mobile broadband, internet access with video footage on the mobile handset. With a 3G phone and access to the 3G networks there would be increased bandwidth, and support to diverse applications such as live streaming, video messaging et al.
4G: 4G refers to the fourth-generation of wireless mobile technology which will supercede 3G. A fully operational 4G is widely expected to facilitate pervasive computing-creating an environment where simultaneous connections to multiple high-speed networks will be a seamless handover across a geographical area.
6LoWPAN: 6LoWPAN refers to a new innovation in IP (Internet Protocol) technology.
IPv6 over Low power Wireless Personal Area Networks or 6LoWPAN makes the Internet of Things to become a reality. 6lowPAN optimizes the mechanisms of wireless embedded networking.