Toll-free telephone numbers are set up with special coding that permits callers to phone a business or an individual without having to pay long distance charges. Incoming calls are routed to the subscriber's phone line, and the related costs are billed to the subscriber.
The Federal Communications Commission governs rules regarding the use of toll-free numbers and how they are obtained. The ability to access the toll-free number database and assign numbers is restricted to certified toll-free service providers. The FCC handles unresolved billing disputes and complaints regarding the use and assignment of numbers. The original toll-free code was 800; as of 2015, the other five available toll-free codes are 888, 877, 866, 855 and 844.