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  2. Toll-free telephone numbers in the North American Numbering ...

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

    In the United States, both interexchange carriers (IXCs) such as Sprint, AT&T Inc., and Verizon, and Local Exchange Carriers (LECs) such as Verizon and AT&T offer toll-free services. [2] [3] The way that a toll-free number is handled depends on whether it is a domestic or an interexchange call.

  3. 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.

  4. AT&T - Wikipedia

    en.wikipedia.org/wiki/AT&T

    AT&T was founded as Bell Telephone Company by Alexander Graham Bell, Thomas Watson and Gardiner Greene Hubbard after Bell's patenting of the telephone in 1875. [22] By 1881, Bell Telephone Company had become the American Bell Telephone Company. [23]

  5. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    The preceding 1 also ideally indicates a toll call; however, this is inconsistent across the NANP because the FCC has left it to the U.S. state public utilities commissions to regulate for traditional landlines, and it has since become moot for mobile phones and digital VoIP services that offer nationwide calling without the extra digit.

  6. Toll-free telephone number - Wikipedia

    en.wikipedia.org/wiki/Toll-free_telephone_number

    Direct inward dialing and toll-free number portability are supported; various providers offer gateways which receive free phone calls on PRI lines and deliver them to voice over IP or pager users. Toll free numbers usually capture the telephone number of the caller for billing purposes through automatic number identification , which is ...

  7. International telecommunications routes - Wikipedia

    en.wikipedia.org/wiki/International...

    On the sending side it looks like an international call, but on the receiving side it looks like a domestic call and settlement is done as if it was a local call. Re-origination or Refiling is the name given to the practice of substituting a new calling line identity ( CLI ) for the call at some point in its journey.

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