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Unlike fixed-line telephones, the long-distance telephone dialing format is always observed when using a mobile phone. Therefore, mobile phone numbers always have the format "+63 912 345 6789" for international callers and "0 912 345 6789" for domestic callers. [citation needed]
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.
Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.
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.
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 ...
Telephone numbers in Brunei Cambodia: 8 +855: 00: Open: Telephone numbers in Cambodia China: 8 +86: 00: Telephone numbers in China Cyprus: 3 +357: 00: Telephone numbers in Cyprus Egypt: 2 +20: 00: Telephone numbers in Egypt Georgia: 9 +995: 00: Telephone numbers in Georgia Hong Kong: 8 +852: 001: No area codes: Telephone numbers in Hong Kong ...
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.