Is 866 a toll-free number?

The telephone code 866 is a prefix used for toll-free telephone numbers in countries that operate under the North American Numbering Plan, the rules governing the use of area codes. This prefix allows callers to place the call for free. The dialed party pays for charges associated with the call.

The 866 prefix was introduced in 2000. Other toll-free prefixes include 800, 844, 855, 877 and 888. Companies known as Responsible Organizations or "RespOrgs" assign toll-free numbers and maintain the SMS/800 Database, which they use to determine number availability. The Federal Communications Commission oversees the activities of RespOrgs and establishes rules and regulations concerning the use and distribution of toll-free numbers.