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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.
For example, to call a number in London using Zone 1511, a subscriber would dial 1511 44 20 xxxx xxxx. Access codes in the 0xx range (for example, 018 - StarHub's VoIP services or 019 - SingTel's VoIP services) indicate a Tier 1 VoIP provider. Access codes like 1xxx (for example, 1511) are indicative of a Tier 2 VoIP provider.
For example, for a number in Costa Rica they would write (506) 2222-2222 instead of +506 2222-2222. On the other hand, Guatemala does have the custom of using the + sign. It is quite common for Central American businesses to write the whole phone number, including the country code in parentheses, on business cards, signs, stationery, etc.
Singapore: 6 +65: 001, 002, 008: No area codes: Telephone numbers in Singapore ... States and territories without a separate country calling code. Country name
Current ISO 3166 country codes. The sortable table below contains the three sets of ISO 3166-1 country codes for each of its 249 countries, links to the ISO 3166-2 country subdivision codes, and the Internet country code top-level domains (ccTLD) which are based on the ISO 3166-1 alpha-2 standard with the few exceptions noted.
ISO 3166-1 ( Codes for the representation of names of countries and their subdivisions – Part 1: Country codes) is a standard defining codes for the names of countries, dependent territories, and special areas of geographical interest. It is the first part of the ISO 3166 standard published by the International Organization for Standardization .
The phone number for a subscriber of such a service starts with +882/+883 followed by the carrier code. The cost to call such a number can be high; for example in the British Telecom price list rates for various 882 and 883 numbers ranged from £0.60 to £4.50 per minute.
10. NANP member. Argentina. +54. 9/15. 10. All carriers: Claro, Movistar, Personal, Tuenti. 15 before the local number but after long distance area code for national calls (0 11 15 xxxx-xxxx) and 9 placed after the international access code excluding the 15 for international calls (+54 9 11 xxxx-xxxx). Armenia.