The North American Numbering Plan (NANP) is an integrated telephone numbering plan that encompasses 25 countries and territories primarily in North America, the Caribbean, and U.S. territories. However, not all North American countries participate in the NANP. The NANP is a system of numbering plan areas (NPA) using telephone numbers consisting of...
Found on
http://en.wikipedia.org/wiki/North_American_Numbering_Plan
(from the article `telephone and telephone system`) Even with the deployment of local automatic switching centres, operators were still required to place long-distance calls through the 1940s. At that ...
Found on
http://www.britannica.com/eb/a-z/n/52
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