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The Italian enclave San Marino has its own country code 378, but landline numbers can be reached using the Italian country code as well: the prefix "0549" is assigned to San Marino. Dialing either "+378 xxxxxx" or "+39 0549 xxxxxx" will reach the same number. Mobile phone customers are sometimes assigned Italian phone numbers.
Worldwide distribution of country calling codes. Regions are coloured by first digit. Telephone country codes, but also sometimes referred to as country dial-in codes, or historically international subscriber dialing (ISD) codes in the U.K., are telephone number dialing prefixes for reaching subscribers in foreign countries or areas via international telecommunication networks.
Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.
When dialing a telephone number, the area code may have to be preceded by a trunk prefix or national access code for domestic calls, and for international calls by the international access code and country code. Area codes are often quoted by including the national access code. For example, a number in London may be listed as 020 7946 0321.
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.
In 1998, as Italy switched to a closed dialing plan, San Marino incorporated the 0549 area code into its subscriber numbers. [7] 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
Area codes 678, 470, and 943 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. State of Georgia in the Atlanta metropolitan area. The area codes are assigned in an overlay plan to a combined numbering plan area (NPA) consisting of 404 (Atlanta and its suburbs inside Interstate 285 ) and 770 (Atlanta suburbs and ...
Formerly, area code 61 was even larger and used to include northwestern Minas Gerais (Unaí, Paracatu), now in that state's area code 38. Until the 1990s, the city of Paranaíba , in the state of Mato Grosso do Sul and served by Companhia Telefônica do Brasil Central (now Algar Telecom ) used the code 176 .