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  2. National conventions for writing telephone numbers - Wikipedia

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

    Landline phone numbers begin with the area code, then one digit for the operator code, then six digits for the primary telephone number. Format: (XXX Y ZZZZZZ) where: "xxx" denotes the area code. All area codes begin with the number 0. The operator code for fixed (landline) numbers is "y".

  3. E.164 - Wikipedia

    en.wikipedia.org/wiki/E.164

    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.

  4. Telephone numbers in the Philippines - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_the...

    The Philippines is assigned an international dialing code of +63 by ITU-T. Telephone numbers are fixed at eight digits for area code 02, and seven digits for area codes from 03X to 09X, with area codes fixed at one, two, or three digits (a six-digit system was used until the mid-1990s; four to five digits were used in the countryside).

  5. Telephone and Data Systems - Wikipedia

    en.wikipedia.org/wiki/Telephone_and_Data_Systems

    Telephone and Data Systems, Inc. is a Chicago -based telecommunications service company providing wireless products and services; cable and wireline broadband, TV and voice services; and hosted and managed services to approximately 6 million customers nationwide through its business units TDS Telecom and U.S. Cellular ( NYSE : USM) and OneNeck ...

  6. E.123 - Wikipedia

    en.wikipedia.org/wiki/E.123

    E.123. E.123 is an international standard by the standardization union ( ITU-T ), entitled Notation for national and international telephone numbers, e-mail addresses and web addresses. [1] It provides guidelines for the presentation of telephone numbers, email addresses, and web addresses in print, on letterheads, and similar purposes.

  7. Telephone numbers in Singapore - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Singapore

    Telephone numbers in Singapore, also known as the National Numbering Plan, are regulated by the Info-communications Media Development Authority (IMDA). Due to the small geographical size of Singapore, there are no area or trunk codes; all numbers belong to one numbering area, and thus come in the same 8-digit format.

  8. Telephone number verification - Wikipedia

    en.wikipedia.org/wiki/Telephone_number_verification

    Telephone number verification. Telephone number verification (or validation) services are online services used to establish whether a given telephone number is in service. They may include a form of Turing test to further determine if a human answers or answering equipment such as a modem, fax, voice mMail or answering machine .

  9. Telephone numbers in Vietnam - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Vietnam

    Mobile telephone numbers. [1] [2] In Vietnam, mobile phone numbers follow the format 09x-xxxxxxx or new prefixes: 03x, 05x, 07x, 08x. The first 0 is the trunk code. The next 2 digits ( 3x, 5x, 7x, 8x or 9y) specify the mobile phone operator. Some mobile phone operators have been given more than one operator code. In Circular No. 22/2014/TT ...