Invention Of Cell Phones

  • Radio technology began .

    Transmission of speech by radio has a long and varied history going back to Reginald Fessenden’s invention and share-to-ship demonstration of radio technology
  • Developing

    The development of mobile telephony began in 1918 with tests of wireless telephony on military trains between Berlin and Zossen
  • Connection through transportation

    In 1924, public trials started with telephone connection on trains between Berlin and Hamburg.
  • Zugtelephonie A.G.

    In 1925, the company Zugteleph-onie A.G. was founded to supply train telephony equipment
  • Deutshce Reichsbahn

    Telephone service in trains of the Deutsche Reichsbahn and the German Mail Service on the route between Hamburg and Berlin was approved and offered to 1st class travelers
  • Mobile Phone Networks

    In the U.S. engineers from Bell Labs began to work on a system to allow mobile users to place and receive telephone calls from automobiles, leading to the inauguration of mobile service on June 17, in St.Louis, Missouri
  • Creation of "AT&T"

    AT&T introduced the first major improve-ment to mobile telephony, giving the improved service the obvious name of Improved Mobile Telephone Service