What is a Toll-Free Number and How Does it Work?
https://www.fcc.gov/sites/default/files/what_is_a_toll_free_number_and_how_does_it_work.pdf
Web ResultDec 31, 2019 · Toll-free codes – 800, 888, 877, 866, 855, 844 and 833. Toll-free numbers are numbers that begin with one of the following three-digit codes: 800, 888, 877, 866, 855, 844 or 833. Although 800, 888, 877, 866, 855, 844 and 833 are all toll-free codes, they are not interchangeable.
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