History of the Mobile Phone

The immediate precursor of the modern mobile phone could be considered to be the radio telephone developed for battlefield communications during the Second World War. Indeed what's now considered as the 0G The problems with these systems were a combination of network congestion and interference and it was the problem of network congestion that ultimately led to the search for a replacement system. In 1947 the modern concept of using hexagonal 'cells' as mobile phone base stations was invented by Bell Labs engineers at AT&T though the concept had to wait until the 1960sthe problem of how a call could be maintained as an user moved from the range of one cell (technically the base station coverage area) to the next and the next. This problem is one that's termed the 'handover' and what Amos Bell invented was the 'call handoff' feature. This allowed users to roam freely between any number of cells, allowing mobile telephony to be used in long-distance journeys and the first mobile phones were fitted in vehicles as car phones.
Motorola Corp in 1973 and he made the first call on this handheld device on April 3^rd and thus changed our world forever. However, it wasn't for a further eight years that NMT (Nordisk MobilTelefoni or Nordiska MobilTelefoni-gruppen, Nordic Mobile Telephone in English) introduced the first fully-automatic cellular telephone system. The father of this system (and of the modern mobile telephone symstem is considered to be Östen Mäkitalo). This system led directly to the 1G(first generation) of mobile phones introduced from the middle to the late 1980s. Because of power requirements and poor battery performance these cellular telephones were still to large and bulky to be properly hand-held devices and most were still fitted as permanent in-car devices. 1G mobile telephones use analogue signals to connect the telephone to a base station though the base station network itself communicates digitally.