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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.
Prefixes starting with 1 are special numbers, such as mobile telephones (15, 16, 17), shared-cost services (180), televoting numbers (13), and 10 for dial-around services. The former codes of 130 for freephone numbers and 190 for premium-rate numbers are moved to 800 and 900 to meet international standards. 700 is used for personal national ...
When dialling within the country, all area codes are preceded by the national ... 447 to 0xxx on 28 April 2001. 01448 — unused; ... The number format '5+4' refers ...
list of mobile allocations [3]; number range operator 2xx xxxx: africell 7xx xxxx 40x xxxx 41x xxxx 3xx xxxx: qcell 50x xxxx 51x xxxx 52x xxxx 53x xxxx 58x xxxx
In 2006, the Illinois Commerce Commission approved an all-services overlay for the numbering plan area, adding new area code 447 in 2021. [3] [4] ...
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.
Toll-free telephone number; 0–9. Area codes 201 and 551; Area codes 202 and 771 ... Area codes 217 and 447; Area code 218; Area code 219; Area code 224; Area code ...