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A jazz musician named Teri Pall invented a version of the cordless phone in 1965 but could not market her invention, as its 2-mile (3.2 km) range caused its radio signals to interfere with aircraft communications. In 1968, she sold her rights to the cordless phone to a manufacturer who modified it for practical use.
The first hand held mobile phone call was made by Martin Cooper, who led the team that developed the first hand held phones. Cooper made his phone call on April 3, 1973 on a prototype Dyna-Tac phone that weighed about 2.5 lb (1.1 kg).