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An engineer demonstrates a car phone five months before the historic first call on a competing company’s commercial mobile telephone service in 1946. Bettmann via Getty Images

The first mobile phone call was 75 years ago – what it takes for technologies to go from breakthrough to big time

The ubiquity of mobile phones is a defining feature of the 21st century, but it’s been possible to place a phone call on the go since shortly after World War II.

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