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History of Mobile Phones
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The history of mobile phones goes a long way with a huge evolution in technologies and commercial researches. The early mobile phone technology can be seen in use in the form of mobile rigs which were employed in taxicab radios and police two way radios. In December 1947, two brilliant Bells Lab engineers, Douglas H. Ring and W. Rae Young, worked together and drafted the hexagonal cell for mobile coverage areas and change over system while the mobile unit was in transit. Philip T Porter, another Bells Lab engineer modified the proposed system so that the towers were at the corners rather than at the centre.
It was Richard H. Frenkiel and Joel S. Engel of Bell Labs who later developed in the electronics to actually implement the system practically in the 1960s.
Ericsson contributed to the history of mobile by developing the early Mobile Telephones system A which was the first fully automated mobile phone system commercially deployed. AT&T developed the Advanced Mobile Phone Service and implemented successfully. The most successful early system used in the history of mobile was the perhaps ARP deployed in Finland in the year 1971 and is sometimes viewed as Generation 0 mobile phones.The First Generation or G1 mobile phones were large and cumbersome, often the size of a briefcase.
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Automatic handover while moving from cell to cell were viable by then. Technology system such as NMT, AMPS, TACS, RTMI, C-Netz and Radiocom 2000 were prevalent. The Second Generation or G2 mobile phones employed systems such as GSM, TDMA and CDMA. By now all signaling and switching has been converted to a fully digital system and the mobile phones had shrunk to a handheld device of 110 to 200 grams.
The Third Generation or G3 is not exactly a technology but a set of specifications set by the IMT-2000 so that all propriety technologies and systems could interact and communicate easily. Systems such as UMTS and CDMA2000 1xEV-DO conform to the standard.
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