us toll free prefix numbers
Toll free codes â 800, 888, 877, 866, 855, 844. Today, there are six toll free codes: 800, 888, 877, 866, 855 and 844. Although 800, 888, 877, 866, 855 and 844 are all toll free codes, they are not interchangeable. 1-800-234-5678 is not the same number as 1-888-234-5678. Calls to each toll free number are routed to a particular local telephone number.