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  2. National conventions for writing telephone numbers - Wikipedia

    en.wikipedia.org/wiki/National_conventions_for...

    There is an international format for recording a telephone number containing the country code, settlement code and telephone number, and the national format containing the settlement code and telephone number. To record Ukrainian telephone numbers, telephone codes for settlements do not have an initial zero, long-distance prefix: 0.

  3. List of telephone country codes - Wikipedia

    en.wikipedia.org/.../List_of_telephone_country_codes

    An area code of three digits dialed after the country code determines the area served in the United States and its territories, Canada, and much of the Caribbean. Zone 2 uses two 2-digit codes (20, 27) and eight sets of 3-digit codes (21x–26x, 28x, 29x), mostly to serve Africa , but also Aruba , Faroe Islands , Greenland and British Indian ...

  4. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    Each three-digit area code has a capacity of 7,919,900 telephone numbers (7,918,900 in the United States). Despite widespread use as fictional telephone numbers in the form NXX 555-XXXX , only line numbers 0100 through 0199 are reserved for this purpose, while 1212 and 4334 are the only assigned uses for directory assistance and other functions.

  5. E.164 - Wikipedia

    en.wikipedia.org/wiki/E.164

    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.

  6. List of mobile telephone prefixes by country - Wikipedia

    en.wikipedia.org/wiki/List_of_mobile_telephone...

    example 971 550 000 000 with country code is 12 digits 56: Etisalat: example 971 560 000 000 with country code is 12 digits 58: Du: example 971 580 000 000 with country code is 12 digits United Kingdom [16] +44: 71xx: 10: 72xx: 73xx: 74xx: 3 (Hutchison 3G UK Ltd) 75xx: 7624: Isle of Man: 76xx is mostly radiopaging 77xx: 78xx: 79xx: United ...

  7. Telephone number verification - Wikipedia

    en.wikipedia.org/wiki/Telephone_number_verification

    A JavaScript function can check to see if a phone number is a valid format, i.e., is numeric, starts with a valid set of numbers ("0" for local, or an international dialing prefix followed by a valid country code) and is not too short to be a phone number. At first a JavaScript function is used to clear out any spacer characters.

  8. E.123 - Wikipedia

    en.wikipedia.org/wiki/E.123

    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.

  9. Telephone number mapping - Wikipedia

    en.wikipedia.org/wiki/Telephone_number_mapping

    Telephone number mapping is a system of unifying the international telephone number system of the public switched telephone network with the Internet addressing and identification name spaces. Internationally, telephone numbers are systematically organized by the E.164 standard, while the Internet uses the Domain Name System (DNS) for linking ...