The location of phones with an 866 area code is not available because they are toll free numbers. The person who receives the call is billed for the call, and not the person who places the call. A number with the 866 area code can originate from any location.
Any phone number beginning with 866, 800, 844, 855, 877 or 888 is a toll free number and not connected to any specific location. Calls from these numbers are charged to the individual who is being called instead of the caller. Because this is a toll-free number, any type of company can use this area code from any location. One way to discern the location of an 866 area code number is to ask the caller where she is calling from. Because of the variability in the location of toll-free phone numbers, this is one of the few options available.
Another way to potentially trace the location of an 866 phone number is to use the 800notes.com website. This site allows users to search previously posted phone numbers with descriptions from users who have been called by them to potentially find a match with someone else who was called by the same number.