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Country codes are defined by the International Telecommunication Union (ITU) in ITU-T standards E.123 and E.164. The prefixes enable international direct dialing (IDD). Country codes constitute the international telephone numbering plan. They are used only when dialing a telephone number in a country or world region other than the caller's.
Mobile phones use geographic area codes (two digits): after that, all numbers assigned to mobile service have nine digits, starting with 6, 7, 8 or 9 (example: 55 15 99999–9999). 90 is not possible, because collect calls start with this number.
A telephone number in San Marino may be reached as follows: [citation needed] 0549 xxx xxx: from Italy +378 xxx xxx: from all other countries +39 0549 xxx xxx: from other countries, using the Italian country code +378 0549 xxx xxx: from other countries, using the San Marino country code and the Italian area code
Toggle Area codes by country, state, province, and regions subsection. 2.1 United States. 2.2 Canada. ... 1-NPA-555-01XX is used for fictional telephone numbers; ...
This code specifies that the entire number should be 15 digits or shorter, and begin with an international calling prefix and a country prefix. For most countries, this is followed by an area code, city code or service number code and the subscriber number, which might consist of the code for a particular telephone exchange.
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Mexican participation was planned, [11] but implementation stopped after three area codes (706, 903 and 905) had been assigned, and Mexico opted for an international numbering format, using country code 52. [12] The area codes in use were subsequently withdrawn in 1991. [13]