area codeIn the North American telephone system, an area code is a three-digit code delineating a "toll" area in the United States, Canada, and Mexico. Area codes are distributed according to the North American Number Plan (NANP). The area code is also referred to as a Number Plan Area or NPA.
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| Last updated on:
Apr 05, 2005 |
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Is an electron’s charge positive or negative?
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