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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.
A Brief History of the Payphone. Invented by William Gray in 1889, he began selling his devices in 1891. The first payphones were opened to the public, using attendants to collect the money and place the calls for you. The payphone went almost ten years before it finally became a coin-operated model that was largely unattended.