When we say 4G we refer to the fourth generation of cellular wireless standards. It is one of the stages broadband mobile comunications that will supercede 3G (the third generation) and older 2G. Main differences between 4G and 3G is different nature of the service, non-backwards compatible transmission technology and new frequency bands.
First development happened 1992. passing from 1981 analogue (1G) to digital (2G). This was followed, in 2002, by 3G multi-media support, spread spectrum transmission and at least 200 kbit/s, soon expected to be replaced by 4G, which refers to all-IP packet-switched networks, mobile ultra-broadband (gigabit speed) access and multi-carrier transmission.
First modern device which support 4G was produced in the December 2009, by Samsung (dongle GT-B3710), and the network infrastructure created by Huawei (in Oslo) and Ericsson (in Stockholm).
Developing of 5G technologies are in progress, especially in South Korea. On July 2008, they announced plan to spend US$58,000,000 on developing 4G and 5G technologies, hoping that will help them to expand their mobile market share.
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