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National conventions for writing telephone numbers : ウィキペディア英語版 | National conventions for writing telephone numbers
The national conventions for writing telephone numbers vary by country. International standards exist in the form of the International Telecommunication Union sector ITU-T issued recommendation E.123. Written conventions are closely related to the telephone numbering plan in use, which defines the length of numbers and assigns them meaning. The presentation of telephone numbers in this article is intended for dialing within each country, and does not include any international dialing codes. In examples, a numeric digit is used only if the digit is the same in every number, and letters to illustrate groups. X is used as a wildcard to represent any digit in lists of numbers. ==North America==
Because the countries of World Numbering Zone 1 (North America) have the country code 1, the same number as is used for the trunk prefix, it is advisable to use international format of writing: Example: Within N. Amer. zone (302)1234567 Telephone International +1302 1234567
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