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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.
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.
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; ...
Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
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The country code for calling Italy from abroad is 39. [3] For calling foreign destinations from Italy, the international call prefix is 00, as is standard in most European countries. Italian regulations prescribe no fixed rules for grouping the digits of telephone numbers for printing or display.