A Brazilian man speaking about his first mobile phone call
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My first mobile phone call: 'I called a former girlfriend!'

5 April 2013 Last updated at 10:44 BST

It has now been 40 years since Motorola engineer Marty Cooper made the first ever mobile phone call.

People from around the world have been reminiscing about the first time they used the little devices which have since become ubiquitous.