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  2. List of mobile virtual network operators in the United States

    en.wikipedia.org/wiki/List_of_mobile_virtual...

    Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.

  3. Toll-free telephone numbers in the North American Numbering Plan

    en.wikipedia.org/wiki/Toll-free_telephone...

    From many countries, such as the U.K., U.S. toll-free numbers can be dialed, but the caller first gets a recorded announcement that the call is not free; in fact, on many carriers, the cost of calling a "toll-free" number can be higher than that of calling a normal number.

  4. Vertical service code - Wikipedia

    en.wikipedia.org/wiki/Vertical_service_code

    As CLASS was an AT&T trademark, the term vertical service code was adopted by the North American Numbering Plan Administration. The use of vertical is a somewhat dated reference to older switching methods and the fact that these services can only be accessed by a telephone subscriber, going up ( vertically ) inside the local central office ...

  5. Toll-free telephone number - Wikipedia

    en.wikipedia.org/wiki/Toll-free_telephone_number

    There are also split-charge numbers in the format "801 uxx xxx" (caller's cost depends on the digit u) and "universal numbers" in the format "804 uxx xxx", where the caller is automatically connected to the nearest office (these numbers are toll-free if u=3). In Portugal, the prefix is "800" so the 9-digit number is "800 xxx xxx".

  6. Visible by Verizon - Wikipedia

    en.wikipedia.org/wiki/Visible_by_Verizon

    Visible Service LLC, doing business as Visible by Verizon, and known simply as Visible, is an American all-digital prepaid mobile virtual network operator (MVNO) and brand wholly-owned by Verizon. Launched in 2018, the carrier offers services on the Verizon network , with all services delivered via e-commerce and mobile apps using generative ...

  7. Automatic number identification - Wikipedia

    en.wikipedia.org/wiki/Automatic_number...

    ANI is conceptually and technically different from caller ID service. [1] A caller's telephone number and line type are captured by ANI service even if caller ID blocking is activated. The destination telephone company switching office can relay the originating telephone number to ANI delivery services subscribers.

  8. Caller ID - Wikipedia

    en.wikipedia.org/wiki/Caller_ID

    Caller-ID system response sounds in various cases: analog, ISDN and digital PBX 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.

  9. Directory assistance - Wikipedia

    en.wikipedia.org/wiki/Directory_assistance

    411 LDA: Local Directory Assistance. 411 is dialed, and the operator is requested to search for a listing in a group of area codes local to the caller . Example: the caller lives in area code 630 (Oak Brook, Illinois) and requests a listing for a business in area code 312 (Chicago, Illinois). In this case, AT&T Illinois bills the call.

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