1900, Reginald Fessenden sent the human voice through the air using radio waves for the first time., 1947, William Rae Young had an idea for a phone network. It used radio towers to connect car phones., 1973, Martin Cooper and his team made the first mobile phone that people could carry in their hands. It was called the Motorola DynaTAC., 1983, Motorola started selling the DynaTAC to the public. It cost $3,995., The 1990s, Mobile phones became smaller, lighter and cheaper. More people could buy them., 1994, IBM made Simon, one of the first smartphones. It had a touchscreen and simple apps.

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