Area code 855: what it is

Calls to 855 numbers are free for the caller. They are used across the U.S., Canada and several Caribbean countries, and they can ring anywhere. The other toll-free codes are 800, 833, 844, 866, 877, 888.

Can a 855 caller be a scammer? Yes. Anyone can rent a toll-free number, and caller ID can be faked. A real business will have a toll-free number on its official website or the back of your card. If a 855 caller says they're from your bank, a government agency or a delivery company, hang up and call the number you already know.

From the NANPA area code database.