Fifty years since the first cell phone call

The cell phone was celebrating its 50th anniversary last month. On April 3, 1973, Martin Cooper, an engineer at Motorola, made the first public call from a mobile phone. This first model, called the DynaTAC, was a large device the size of a brick, weighing 2.5 pounds, and costing nearly $4,000. - Bruno Guglielminetti

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