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Telephone prefix
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.
Some places restrict certain prefixes to fax numbers or cell phones only; in other places such dedicated prefixes are not used.
As 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.〔(umber blocks served by the Kentish Town exchange )〕
==History==
In the earliest days of telephony an operator at the exchange connected calls to a named subscriber; later, numbers were allocated to each subscriber on an exchange, but users on different exchanges could not speak to each other. As progress was made, exchanges were connected together, initially connected by the operator by name, and later dialled by users with prefixes such as WHI (for the ''WHI''tehall exchange, hence the famous Whitehall 1212 number for Scotland Yard), with letters corresponding to numbers on the dial (WHI was equivalent to 944), later replaced by the numerical prefixes which remain in use.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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