As well as the 866 area code, the other toll-free area codes are 800, 833, 844, 855, 877 and 888. They are toll-free within the USA, Canada and all countries utilising the North American Numbering Plan. They are commonly associated with customer service lines for companies, but can be used by other parties.

Who is calling from 866?

A prefix of 866 represents calls that are paid for by the recipient, rather than the caller. When people think of toll free calling, they usually think of 800 numbers, but there are many other options that function in the same way.

Why is an 866 number calling me?

800, 888, 877, 866 and 855 are the only toll free numbers in existence. Don’t let someone fool you into calling similar-sounding numbers just pocket your money. This is money laundering and is against the law. Report anything suspicious to the FCC.

Unless you know that a call is legitimate, it’s best to avoid calls from the following international area codes with a +1-country code:
232: Sierra Leone.242: Bahamas.246: Barbados.284: British Virgin Islands.268: Antigua and Barbuda.345: Cayman Islands.441: Bermuda.473: Grenada, Carriacou and Petite Martinique.