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Martin Cooper, chairman and CEO of ArrayComm, holds
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Martin Cooper, chairman and CEO of ArrayComm, holds a Motorola DynaTAC. On April 3, 1973, Cooper, then a Motorola employee, used the same model to make the world's first commercial cellphone call. (April 2, 2003)(Credit: AP)

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Cellphones through the years

The first mobile phone call was made 40 years ago on April 3, 1973, using a Motorola DynaTAC, nicknamed a "brick" because of its size. Four decades later, cellphones are slimmer, sleeker and used for much more than making phone calls. Here is a look at how mobile phones have changed over the years.

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