3 abr 1973 año - The first mobile phone prototype, the DynaTAC was introduced at a press conference in New York by Martin Cooper. The DynaTAC (Dynamic Adaptive Total Area Coverage) phone, was 23 cm (9 inches) tall and weighed 1.1 kg (2.5 pounds). It allowed 35 minutes of usage before its battery ran out. It needed to be charged for 10 hours to achieve full battery. Before The DynaTAC, phones existed in cars, starting in 1947 Motorola.
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Source:https://www.britannica.com/biography/Martin-Cooper
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3 abr 1973 año
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~ 52 years ago