4G is the name given to the fourth generation of wireless technology. The technology proposals have been submitted to the International Telecommunication Union(ITU) as 4G candidates on Sept 2009. It's essentially the successor of 2G and 3G of mobile technology.
Confusion has often been caused by some mobile carriers who have launched products advertised as 4G but which are actually current so-called 3.9G technologies, and therefore do not follow the ITU-R defined principles for 4G standards.http://en.wikipedia.org/wiki/4g
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