The First Mobile Phone Call Was Made in 1973 — and It Was to a Rival

When Martin Cooper pressed the call button on his DynaTAC prototype on April 3, 1973, he was standing on Sixth Avenue in Manhattan, surrounded by bewildered pedestrians staring at a man talking into a device the size of a brick. The call he made was not to his wife, not to a colleague, not to a newspaper. He called Joel Engel, the head of research at Bell Laboratories — Motorola's chief rival in the race to develop cellular technology — and told him that Motorola had just beaten them to the first mobile phone call.

The exchange was brief. Engel, to his credit, took the news graciously. But the moment Cooper describes it with obvious relish even decades later, there is something deeply human about the impulse: after years of competitive development, the first thing you want to do with your world-changing invention is call the person you beat.

The Race to Cellular Technology

The concept of cellular communications had been theorized since the 1940s, when Bell Labs engineers D.H. Ring and W. Rae Young first proposed dividing geographic areas into hexagonal "cells," each with its own base station, that could hand off calls as a user moved between them. The cellular concept solved the fundamental problem of radio telephony: there are only so many frequencies available, and a non-cellular system could only support a handful of simultaneous users in any given area. Cells allowed the same frequencies to be reused in non-adjacent areas, dramatically expanding capacity.

By the early 1970s, AT&T's Bell Labs was developing its own cellular system and pressing the Federal Communications Commission for spectrum allocation to build it out. Motorola, then primarily a radio communications company, saw the cellular future coming and feared being locked out by a Bell monopoly. Cooper, who was running Motorola's communications division, argued internally that the future was not car phones — the cumbersome devices already available that connected through mobile radio systems — but truly portable handsets that people would carry in their pockets.

Building the DynaTAC

The prototype Cooper carried on that April day in 1973 was the DynaTAC, short for Dynamic Adaptive Total Area Coverage. It was approximately 25 centimeters long, weighed 1.1 kilograms, and could sustain a call for just 20 minutes before its battery died. Recharging took 10 hours. It had no screen, no memory for storing numbers, no ability to receive incoming calls while in standby. By any modern standard, it was barely functional.

But it was portable. It did not require a car. It did not need a fixed connection to a telephone network. A person carrying it could walk down a sidewalk and place a call, which is exactly what Cooper did and what no human being had ever done before. The FCC was watching Motorola's demonstration closely, weighing the spectrum allocation decisions that would shape the cellular industry for decades. Cooper's sidewalk call was partly a technical demonstration and partly a lobbying act, a public statement that true portable telephony was real and ready for investment.

From 1973 to a Trillion-Dollar Industry

The commercial DynaTAC 8000x, which looked broadly similar to Cooper's 1973 prototype, finally went on sale in 1983 — a full decade after the first call — priced at $3,995 (equivalent to over $12,000 today). It sold briskly despite the price, demonstrating the pent-up demand for mobile communication that Cooper had predicted. The cellular networks needed to support it had spent those intervening years being built out across American cities, each tower carefully positioned to create the overlapping cells that Ring and Young had theorized forty years earlier.

Cooper himself has described the development of the mobile phone as an inevitability — the technology existed, the demand existed, and someone was going to build it. What is less inevitable, and what his 1973 call illustrates perfectly, is the spirit in which breakthroughs arrive: not in a controlled laboratory setting but on a noisy Manhattan sidewalk, with passersby gawking, and the first call going not to posterity but to the competition.