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It was not until the early 1950's that the Bell System widely embraced the "dial tone", which was originally invented by Siemens in 1908, and thought of it to be a good substitute for an operator's "Number please" and placed the service in all of their automatic switching centers. In 1951, AT&T introduced customer-dialing of long distance phone calls across the nation, which no longer required the assistance of an operator.
1962 witnessed the launch of the first commercial communications satellite (Telstar I), providing 240 two-way telephone circuits. In 1963, the development of the first touch-tone phone was introduced, the Western Electric 1500...
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