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Sources of information on the history and development of worldwide public telephone numbering plans.
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800 Service Management System - Information about the central database for US toll free number management. The Telephone Exchange Name Project - The historical relationship between North American telephone exchange names and numbers. International Numbering Plans - A collection of all international numbering plans in the world. Some features require a paid subscription.
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See Also
Regulation
Business : Telecommunications 66 Sites
Area Codes
Reference : Directories : Address and Phone Numbers 26 Sites
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