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Telephone numbering plans are defined in each of the administrative regions of the public switched telephone network (PSTN) and in private telephone networks. For public numbering systems, geographic location typically plays a role in the sequence of numbers assigned to each telephone subscriber.
A traditional North American rotary telephone dial on the Western Electric 500. The associative lettering was originally used for dialing named exchanges but was kept because it facilitated memorization of telephone numbers. A rotary dial is a component of a telephone or a telephone switchboard that implements a signaling technology in ...