How do I get a Toll-Free Number or any Toll Free prefix?

Today, there are seven toll-free codes: 800, 888, 877, 866, 855, 844 and 833. Although 800, 888, 877, 866, 855, 844 and 833 are all toll-free codes, they are not interchangeable. 1-800-234-5678 is not the same number as 1-888-234-5678.