1973 was a cool spring day in New York City. , , People were walking in the street when they saw a man with a large object in his hand. , , He was holding it next to his ear and he was talking. , , Joel Engel worked for a rival company. , , Martin Cooper was using a handheld portable cell phone. , , The battery lasted only twenty minutes. , , You can charge modern smartphones with a portable charger. , , There are apps for everything you want to do. .

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