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Telephone numbers in Nigeria use an open numbering plan. They are composed of a combination of an area code and a local line or subscriber telephone number ...
Area code, subaddress and name are optional; the latter can carry extension number for direct inward dialing and calling party name, as used by ISDN/E1/T1 telecommunication protocols. Dialing rules are used to transform the canonical phone number into a dialable calling sequence for the modem , depending on the user's location.
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.
Telephone numbers in São Tomé and Príncipe: East Africa Burundi +257: 00: Telephone numbers in Burundi Comoros +269: 00: Telephone numbers in the Comoros Kenya +254: 000: Telephone numbers in Kenya Madagascar +261: 00: Telephone numbers in Madagascar Malawi +265: 00: Telephone numbers in Malawi Mauritius +230: 00: Telephone numbers in ...
Peru uses 2-digit area codes followed by 6-digit subscriber numbers outside of Lima. In Lima the area code is "1" and the subscriber number has seven digits, divided XXX XXXX. The "trunk 0" is often used, especially for numbers outside Lima. For example, a phone number in Arequipa might be written (054) XX-XXXX.
A virtual number, also known as direct inward dialing (DID) or access numbers, is a telephone number without a directly associated telephone line. Usually, these numbers are programmed to forward incoming calls to one of the pre-set telephone numbers, chosen by the client: fixed, mobile or VoIP .
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.
A telephone line is terminated at a telephone interface (fax modem) of a computer that runs fax server software. A set of digits of the assigned phone number is used to identify the recipient of the fax. This allows many recipients to have individual fax numbers while sharing only a few receiving interfaces (fax modems).