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A telephone number is a sequence of digits assigned to a fixed-line telephone subscriber station connected to a telephone line or to a wireless electronic telephony device, such as a radio telephone or a mobile telephone, or to other devices for data transmission via the public switched telephone network (PSTN) or other private networks.
A telephone prefix is the first set of digits after the country-and area codes of a telephone number; in the North American Numbering Plan countries (country code 1), it is the first three digits of a seven-digit phone number.In other countries both the prefix and the number may have different lengths.It shows which exchange the remaining numbers refer to. A full telephone number is usually made up of country code (required for international calls only), area code (required for calls between telephone areas), prefix, and subscriber number.s telephone technology advanced, the precise significance of the prefix became blurred in many places; 485 in London, UK, was once the GUL liver exchange, but now 44207 485 xxxx is just considered one of many number blocks served by the CLKEN Kentish Town exchange; 44207 70703 xx is another.