What is what area code is 866?

Area code 866 is a toll-free area code in North America. This means that calls made to phone numbers with the 866 area code are free for the caller; the cost is borne by the called party. It is one of several toll-free area codes, including 800, 877, 888, 855, 844 and 833. It was introduced to provide additional toll-free numbers as the 800 area code became exhausted. These area codes are not tied to any specific geographic location.