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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