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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.
Calls from landlines to both landline and mobile numbers are placed by dialing the 10-digit subscriber number with no prefix. Calling internationally from Colombian landlines requires a carrier-selection code be included after the 00 IDD prefix, before the country code and foreign subscriber number:
8~57 – Transtelecom; 8~58 – MTT; 8~59 – Orange Business Services; 99x, where x is a carrier selection code: Finland, alongside the standard prefix 00 for the default carrier, carrier selection code consisting of either a single digit (1–4, 6–9) or three digits (511–599) [1] 99 0 – Telia Finland Oyj; 99 1 – Elisa Oyj; 99 511 ...
Access codes; Country code +227: International access: 00: Long-distance: ... 57 XX XX: 96 57 XX XX 58 XX XX: 96 58 XX XX ... Emergency calls: CELTEL, SAHELCOM ...
2 List of number ranges in the Central African Republic. ... Access codes; Country code +236: International access: 00: ... 57 XX XX. 58 XX XX.
Malicious caller identification, introduced in 1992 as Call Trace, [1] also called malicious call trace or caller-activated malicious call trace, is activated by the vertical service code *57 ("star fifty-seven"), and is an upcharge fee subscription service offered by telephone company providers which, when dialed immediately after a malicious call, records metadata for police follow-up.
In 2014, India's Aam Aadmi Party used missed call numbers for a recruitment campaign. In less than a month, the line was used to recruit 700,000 new members. [20] On 31 January 2016, Indian Prime Minister Narendra Modi's monthly radio address Mann Ki Baat became available by phone through a missed call number. A government official stated that ...