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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.
Overseas calls to locations outside the NANP are dialled with the 011 international prefix, followed by the country code and the national significant number. Canada was divided into nine numbering plan areas with unique area codes in 1947 when the American Telephone and Telegraph Company (AT&T) designed the first comprehensive telephone ...
This is a list of international dialing prefixes used in various countries for direct dialing of international telephone calls.These prefixes are typically required only when dialling from a landline, while in GSM-compliant mobile phone (cell phone) systems, the symbol + before the country code may be used irrespective of where the telephone is used at that moment; the network operator ...
This is a listing of lists of country codes: List of ISO country codes (ISO 3166) ITU country code (International Telecommunication Union) List of country calling codes E.164; Mobile country code E.212; Maritime identification digits; List of ITU letter codes (radiocommunication division) UIC country code (International Union of Railways) List ...
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.
There is an international format for recording a telephone number containing the country code, settlement code and telephone number, and the national format containing the settlement code and telephone number. To record Ukrainian telephone numbers, telephone codes for settlements do not have an initial zero, long-distance prefix: 0.
When printing telephone numbers this is indicated by a plus-sign (+) in front of a complete international telephone number, per recommendation E164 by the ITU. History The International Telecommunications Union (ITU) created country codes for international dialing, first introduced in 1960 for Europe and expanded globally in 1964.
In the Philippines, the prefix for toll-free numbers is "1800" followed by either one, two, or four digits (examples include 8, 10, and 1888), and then by either a four- or seven-digit phone number. However, there are restrictions. Toll-free numbers are limited to the telephone network where the toll-free number is being handled.