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The International Telecommunication Union (ITU) has established a comprehensive numbering plan, designated E.164, for uniform interoperability of the networks of its member state or regional administrations. It is an open numbering plan but imposes a maximum length of 15 digits to telephone numbers.
The presentation of a telephone number with the plus sign indicates that the number should be dialed with an international calling prefix, in place of the plus sign. The number is presented starting the country calling code. This is called the globalized format of an E.164 number, and is defined in the Internet Engineering Task Force RFC 2806. [6]
Landlines: Written as AAA-BBBBBBB, where AAA is the Subscriber Trunk Dialing code (long-distance code) and BBBBBBB is the phone number. The total length of the Subscriber Trunk Dialing code and the phone number is ten digits. The Subscriber Trunk Dialing code can have from two digits (11 or 011) up to four digits.
Worldwide distribution of country calling codes. Regions are coloured by first digit. Telephone country codes, but also sometimes referred to as "country dial-in codes", or historically "international subscriber dialing" (ISD) codes in the U.K., are telephone number dialing prefixes for reaching subscribers in foreign countries or areas via international telecommunication networks.
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 ...
National number length Dialing plan International access code National trunk prefix Abkhazia † 7 840 (landline) / 7 940 (mobile) 7 variable 8~10 8 Albania: 355 8 (fixed), 9 (mobile) variable 00 0 Andorra: 376 6 or 9 (in special cases) fixed 00 – Armenia: 374 8 variable 00 0 Azerbaijan: 994 9 variable 00 0 Belarus: 375 9 variable 00 0
Geographic area codes have a length of two to five digits. The maximum length of a complete telephone number is eleven digits. Numbers for geographic area codes are assigned to carriers in blocks. Subscriber numbers do not start with 0 or 11 and can be dialled without area code from landlines within the same geographic area code.
The number contains the information necessary to identify the intended endpoint for a telephone call. Many countries use fixed-length numbers in a so-called closed numbering plan. [5] A prominent system of this type is the North American Numbering Plan.