How is 3G different from 2G and 4G?
While 2G stands for second-generation wireless telephone technology, 1G networks used are analog, 2G networks are digital and 3G (third-generation) technology is used to enhance mobile phone standards.
While 2G is focused on voice, 3G supports high-speed data of at least 144 kbps enabling broadband Internet access on the mobile, and 'triple play' features like mobile TV and converged communication services.
3G helps to simultaneously transfer both voice data (a telephone call) and non-voice data (such as downloading information, exchanging e-mail, and instant messaging. The highlight of 3G is video telephony. 4G technology stands to be the future standard of wireless devices.
Currently, Japanese company NTT DoCoMo and Samsung are testing 4G communication.
Image: A day after Apple's iPhone 3G went officially on sale across Asia placards advertising the iPhone 3G versions offered on the black market are displayed by independent telephone shops in Hong Kong on July 12, 2008. | Photograph: Andrew Ross/AFP/Getty Images
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