Where is area code 866

Where Is Area Code 866

866 Area Code in which state?

This person keeps calling me

And leave a voicemail.

But I don't hear anything

Because I don't want to waste my minutes.

MDR

update

How can I know without calling him?

866 is a toll free number.

Anything between 800, 888 or 866 is free. No particular country is attached.

Where Is Area Code 866