877 Area Code History:

With toll free numbers the charges are paid for by the party who is called instead of the caller.
Although area code 877 is not assigned to a geographical area, calls to any toll free number may be restricted by the customer. Other toll free area codes are 800, 866, 877, and 888. Area code 855 is scheduled to be implemented on October 1, 2010 as a toll free number. Read more about toll free numbers.