Dr. Martin Cooper (born December 26, 1928), a former Motorola executive at Motorola, is credited with inventing the first hand-held telephone and the first to make a phone call in April 1973. The first call he made was with his rival, Joel Engel, Research Director at Bell Labs.
On April 3, 1973, Martin Cooper made a call from the DynaTAC prototype to the media and to passers-by prior to walking into a scheduled press conference at the New York City Hilton in midtown Manhattan.
The call connected him to a base station Motorola had installed on the roof of the Burlington House (now the AllianceBernstein Building) and into the AT&T land-line telephone system. Reporters and onlookers watched as Cooper dialed the number of his chief competitor Dr. Joel S. Engel at AT&T. "Joel, this is Marty. I'm calling you from a cell phone, a real handheld portable cell phone." That public demonstration landed the DynaTAC on the July 1973 cover of Popular Science Magazine.
That first cell phone began a fundamental technology and communications market shift to making phone calls to a person instead of to a place. Bell Labs had introduced the idea of cellular communications in 1947, but their first systems were limited to car phones which required roughly 30 pounds (12 kg) of equipment in the trunk.
Martin Cooper's original "shoe" phone was quite bulky, almost as big as a shoebox, allowing users to talk for only 35 minutes and requiring 10 hours to recharge.
Motorola spent 10 years overcoming technical and regulatory hurdles, and began commercial service in 1983 using a slimmer 16-ounce model that cost between $3,500 and $4,000.
The early phones were too big and expensive to suit most consumers, but they set a precedent for today’s sleek and lightweight models that have become standard equipment for just about everybody.
According to Wikipedia & aarp.org