Iran Press/ Sci & Tech: Motorola engineer Martin Cooper rang his counterpart at rival firm Bell Laboratories, to triumphantly tell him he was calling from "a personal, handheld, portable cell phone".
The basics of how that first call worked haven't changed much. The phone converts your voice into an electric signal, which modulates a radio wave. The radio wave goes to a mast; the mast sends your voice to the person you are calling, and by reversing the process, that person can then hear you speak.
Except there weren't really many masts back then... But you get the idea.
Today's mobile phones, however, are unrecognizable when compared with that early Motorola model.
The commercial version of Marty Cooper's prototype, the Motorola Dynatac 8000X, was released 11 years after that first call, in 1984. It would cost the equivalent of £9,500 ($11,700) if bought today, says Ben Wood, who runs the Mobile Phone Museum.
"There was no messaging, no camera. Thirty minutes of talk-time, 10 hours to charge the battery, about 12 hours of standby time and a 6in (15cm) antenna on the top," Mr. Cooper explains.
It also weighed 790g (1.7lb) - nearly four times the weight of the iPhone 14, at 172g.
The inventor believes that; in the future, artificial intelligence will either create, or select, phone owners' apps for them, depending on their individual needs, and cell phones will be the central part of this great future.
"We are still at the very beginning of the cell phone revolution," he declares.
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