Fifty years ago, Martin Cooper was a man with a dream. A senior engineer with the U.S. telecoms firm Motorola, he was obsessed with making a mobile communication device inspired by the wrist-radio worn by the comic-book detective Dick Tracy.On April 3, 1973, Cooper summoned the press to the New York Hilton. Brandishing a colossal white phone, the size of the proverbial brick,

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