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In the US, phone numbers are constructed with a 3-digital area code, followed by a 7-digit local number. To dial abroad to the US, you'd use the following international country code: +1.

For example, if a contact in the United States (country code "1") has the area code "408" and phone number "-X", you'd enter +1 408 X.

001, or +1 is the telephone calling code of North America; which includes Canada, the United States and the Caribbean.

The countries that were most influential in the telecommunications union, combined with those who had the largest population, were given the shortest and thus the simplest codes to enter. Therefore, it may not be surprising that the US and Canada received the single-digit country code +1.

Since the U.S. and Canada both use the North American Numbering Plan, the commonly accepted formatting of phone numbers is (NPA) NXX-X, NPA-NXX-X or 1-NPA-NXX-X. The 'NPA' is the area code, 'NXX' is the central office code, and 'X' is the subscriber number personal to each phone.

The NANP numbering format may be summarized in the ten-digit notation NXX NXX-X, where the Ns denote any of the digits 2?9, and the Xs denote any digit 0?9. The first NXX block is the numbering plan area code. When the second and third digits are the same, the code is an easily recognizable code (ERC).

US Phone Number Format The country code, followed by the three digit area code, the three digit exchange code, and the four digit line number. The US phone number format follows the North American Numbering Plan convention adopted by the US, Canada, and the other countries of the North America and Caribbean region.