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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.
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 is an international standard ( ITU-T Recommendation), titled The international public telecommunication numbering plan, that defines a numbering plan for the worldwide public switched telephone network (PSTN) and some other data networks . E.164 defines a general format for international telephone numbers.
As such, a typical telephone number in Metro Manila and Rizal would look like this: Within Metro Manila, Rizal, and cities of Bacoor and San Pedro: 8123-4567. Outside Metro Manila, Rizal, and cities of Bacoor and San Pedro: 02-8123-4567. Overseas calls: +63-2-8123-4567. Since October 6, 2019, all telephone numbers with the area code 2 were ...
Mobile telephone numbering. Mobiles similarly changed, with the digits 9 T replacing the prefix 093 T, where T is a digit specific to a mobile operator, that can be 1 ( Telecel, now Vodafone Portugal ), 0, 2 or 6 ( TMN / MEO) or 3 ( Optimus / NOS ): xxx xxxx (before 1999 for Portuguese subscribers using the same mobile operator)
It is a closed numbering plan, [1] which means that all telephone numbers, including the area code, have a fixed number of digits. Swiss area codes are officially termed national destination codes (NDC). A complete telephone number consists of ten digits: 0xx xxx xx xx. Two formats are distinguished: three digits for the NDC and seven digits ...
To call the number (19) 4001-3579 from a payphone in Piracicaba (within area 19, but outside the metropolitan region of Campinas): 0 XX 19 4001 3579. To call the number (19) 4001-3456 from a cell phone working in Rio Claro (also outside the Metropolitan Region of Campinas, but also in area 19 ): 4001 3456.
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.