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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.
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.
They must be dialed with 7 digits from any phone (in the country. The number format is 444 XX XX. To dial call center numbers from other countries, the number must be dialed as country code + call center number like 90 444 XX XX. If you dial a call center number with the area code an IVR says you must not use the area code. Dialing procedure:
Mobile phone numbers are not uniquely different from land-line numbers, and thus follow the same rules for format and area code. Numbers may be ported between landline and mobile. The rarely used non-geographic area code 600 is an exception to this pattern (non-portable, and allows caller-pays-airtime satellite telephony); some independent ...
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.
Land line phone numbers in Kenya follow the format Area Code + Phone Number. To dial a number within an area or city, only the phone number needs to be dialled. When dialling from a different area or city, the telephone number is dialled in the format 0 + Area Code + Phone Number. When dialling from abroad, the 0 is omitted.
International access: 00: Long-distance: none: Telephone numbers in Oman have a country calling code of +968 and an 8-digit National Significant Number (NSN). [1]