Toll free 800 number prefixes include 800, 888, 877, 866, and 855. These multiple prefixes exist due to increasing toll free 800 number demands, allowing callers and businesses to connect at no charge to the customer or client, a courtesy of the business.
The 800 number prefix was first introduced in 1967, and it functioned as the sole toll-free area code for businesses, services, and charities for nearly thirty years. That was until the FCC introduced the 888 number prefix in 1996 as the Internet added new Domain Name Systems. The other prefixes followed thereafter.