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  2. Caller ID - Wikipedia

    en.wikipedia.org/wiki/Caller_ID

    Caller identification (Caller ID) is a telephone service, available in analog and digital telephone systems, including voice over IP (VoIP), that transmits a caller 's telephone number to the called party 's telephone equipment when the call is being set up. The caller ID service may include the transmission of a name associated with the ...

  3. Telephone directory - Wikipedia

    en.wikipedia.org/wiki/Telephone_directory

    Telephone directory. A telephone directory, commonly called a telephone book, telephone address book, phonebook, or the white and yellow pages, is a listing of telephone subscribers in a geographical area or subscribers to services provided by the organization that publishes the directory. Its purpose is to allow the telephone number of a ...

  4. BT Mobile - Wikipedia

    en.wikipedia.org/wiki/BT_Mobile

    BT introduced 4G calling on 29 March 2018, which allows customers to make calls over 4G and can continue to use 4G data as they talk. It works on any Apple handset from iPhone 6 onwards and certain Android handsets bought from BT Mobile. For existing customers, BT's 'My BT' and BT Mobile app offer the ability to check phone compatibility.

  5. Directory assistance - Wikipedia

    en.wikipedia.org/wiki/Directory_assistance

    In the U.S., directory assistance for companies with toll-free "800 numbers" (with area codes 800, 833, 844, 855, 866, 877, and 888) was available from toll-free directory assistance, reachable by dialing 1-800-555-1212, for many decades until it was discontinued in 2020. [citation needed] Toll-free directory assistance was provided by ...

  6. Telephone numbers in the United Kingdom - Wikipedia

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

    In the United Kingdom, telephone numbers are administered by the Office of Communications (Ofcom). For this purpose, Ofcom established a telephone numbering plan, known as the National Telephone Numbering Plan, which is the system for assigning telephone numbers to subscriber stations. Telephone numbers are of variable length.

  7. Reverse telephone directory - Wikipedia

    en.wikipedia.org/wiki/Reverse_telephone_directory

    A reverse telephone directory (also known as a gray pages directory, criss-cross directory or reverse phone lookup) is a collection of telephone numbers and associated customer details. However, unlike a standard telephone directory, where the user uses customer's details (such as name and address) in order to retrieve the telephone number of ...

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