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the development of devices which connect wirelessly to the public switched telephone network. The transmission of speech by
radio has a long and varied history going back to Reginald Fessenden's invention and shore-to-ship demonstration of radio
telephony, through the Second World War with military use of radio telephony links. Hand-held radio transceivers have been
available since the 1940s. Mobile telephones for automobiles became available from some telephone companies in the 1940s.
Early devices were bulky and consumed high power and the network supported only a few simultaneous conversations. Modern cellular
networks allow automatic and pervasive use of mobile phones for voice and data communications.
Mobile phone history is often divided into generations (first, second, third and so on) to mark significant step changes in
capabilities as the technology improved., SaxoTrader