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

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

    Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing code in the group NXX for various other purposes.

  3. Robocall - Wikipedia

    en.wikipedia.org/wiki/Robocall

    A robocall is a phone call that uses a computerized autodialer to deliver a pre-recorded message, as if from a robot.Robocalls are often associated with political and telemarketing phone campaigns, but can also be used for public service, emergency announcements, or scammers.

  4. Area code 770 - Wikipedia

    en.wikipedia.org/wiki/Area_code_770

    As a result, just three years later, in 1995, almost all of Atlanta's suburban ring was split off as area code 770. [1] Atlanta was the first city in the United States to have mandatory ten-digit dialing throughout its metro area, roughly coinciding with the 1996 Summer Olympics in Atlanta.