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The International Telecommunication Union (ITU) publishes a recommendation entitled Notation for national and international telephone numbers, e-mail addresses and Web addresses. Recommendation E.123 specifies the format of telephone numbers assigned to telephones and similar communication endpoints in national telephone numbering plans.
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.
In the international telephone network, the format of telephone numbers is standardized by ITU-T recommendation E.164. This code specifies that the entire number should be 15 digits or shorter, and begin with an international calling prefix and a country prefix.
E.164 defines a general format for international telephone numbers. Plan-conforming telephone numbers are limited to only digits and to a maximum of fifteen digits. [ 1 ] The specification divides the digit string into a country code of one to three digits, and the subscriber telephone number of a maximum of twelve digits.
Microsoft canonical address format for telephone numbers [2] [3] derives from E.123 international notation by allowing explicit indication of area code with parentheses. The canonical format is used by the Telephony API (TAPI) , a Windows programming interface for dial-up fax, modem, and telephone equipment.
Users can now switch carriers and keep their cell phone numbers, including prefix 89: Telenor (Bulgaria) Users can now switch carriers and keep their cell phone numbers, including prefix 988: Other mobile networks: Users can now switch carriers and keep their cell phone numbers, including prefix Burkina Faso +226: 70: 8: Telmob: 71: 72: 74 ...
Telephone numbers in the Philippines follow an open telephone numbering plan and an open dial plan. Both plans are regulated by the National Telecommunications Commission, an attached agency under the Department of Information and Communications Technology (DICT). The Philippines is assigned an international dialing code of +63 by ITU-T.
All telephone numbers are 11 digits long (initial 0 plus ten numbers). The first two or three digits after the zero are the area code. The possibilities are: (0XX) XXXX XXXX (for landlines), 09XX XXX XXXX (for cellphones) and 099XX XXX XXX (for MVNO). The initial zero is replaceable with +98.