40 years of mobile phones

It is 40 years since the first experimental mobile phone call was made on April 3 1973 by Motorola employee Martin Cooper.

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Sound of stunned silence in first ever mobile phone call

The man who made the first mobile phone call exactly 40 years ago says all he could hear was the sound of stunned silence, because the person on the other end couldn't believe it. Martin Cooper called rival company AT&T who were still focused on making phones that only worked in cars.

In 1973 the battery life was only 20 minutes, but that didn't matter because the phone was so heavy. Martin Cooper spoke to Geraint Vincent via a newer telecommunications device - Skype:

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