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In 1908, Professor Albert Jahn and the Oakland Transcontinental Aerial Telephone and Power Company claimed to have developed a wireless telephone. They were later accused of fraud in a case which was ultimately dismissed; nevertheless, no phones ended up being manufactured.[2] In 1917, the Finnish inventor Eric Tigerstedt successfully filed a patent for a "pocket-size folding telephone with a very thin carbon microphone". Beginning in 1918, the German railroad system tested wireless telephony on military trains between Berlin and Zossen.[3] In 1924, public trials started with telephone connection on trains between Berlin and Hamburg. In 1925, the company Zugtelephonie AG was founded to supply train-telephony equipment and, in 1926, 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 first-class travelers.[4]
Karl Arnold 1926 drawing of public use of mobile telephones.
Fiction anticipated the development of real-world mobile telephones. In 1906, the English caricaturist Lewis Baumer published a cartoon in Punch entitled "Forecasts for 1907"[4] in which he showed a man and a woman in London's Hyde Park each separately engaged in gambling and dating on wireless-telegraphy equipment.[5] Cartoonist W. K. Haselden published The Pocket Telephone: When Will It Ring? in 1919, depicting six awkward possibilities.[6][7] In 1923, Ilya Ehrenburg casually listed "pocket telephones" among the achievements of contemporary technology in a story in his collection Thirteen Pipes (Russian: Тринадцать трубок).[8] In 1926, the artist Karl Arnold drew a visionary cartoon about the use of mobile phones in the street, in the picture "wireless telephony", published in the German satirical magazine Simplicissimus.[9] The popular American cartoon detective Dick Tracy acquired a two-way, atomic-battery-powered wrist radio in 1946, upgraded to a wrist TV in 1964.[10]
The Second World War (1939-1945) saw the 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, consumed large amounts of 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 communication.)
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