is 1-866 numbers free to call
Toll-free numbers in the North American Numbering Plan (NANP) are commonly called ``800 numbers'' after the original area code which was used to dial them. They include the area code 800 (since January 1, 1966), 888 (since March 1, 1996), 877 (since April 4, 1998), 866 (since July 29, 2000), 855 (since October 9, 2010), 844 (since December 7, 2013), and 833 (since April 22, 2017). Area codes reserved for future expansion include 822, 880 through 887, and 889.
Toll-free telephone number