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On April 3, 1973 in New York City, Motorola employee Martin Cooper made the first call on a commercial cell phone.

He used a prototype of the world's first commercial cell phone, the Motorola DynaTAC 8000x.

The original cell phone was 10 inches long and weighed 2.5 pounds.

These days most modern smartphones weigh between four and six ounces.

Here's a look at the evolution of the cell phone in 20 images.

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