A toll-free number begins with 1-800, 1-833, 1-844, 1-855, 1-866, 1-877, or 1-888 and is free to domestic callers, which can include everyone in the US, the U.S., and Canada or the U.S., Canada and the Caribbean, depending on the business’s plan. VoIP toll-free pricing is usually low, and a toll-free number’s expected call volume determines the monthly plan or rate.