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866 is an area code for toll-free telephone numbers, also known as freephone or freecall. Toll-free means that charges are paid by the person called instead of the caller.
The 866 number was introduced in July 2000 as a part of the “800 numbers” group originally started with the 800 area code number.
The 866 area code does not cover a specific geographical area or time zone.
Area Code 866 Extensions