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Today, there are six toll free codes: 800, 888, 877, 866, 855, and 844. Although 800, 888, 877, 866, 855, and 844 are all toll free codes, they are not interchangeable. For example, 1-800-234-5678 is not the same number as 1-888-234-5678.
In 1967, AT&T rolled out the first 1-800 toll-free numbers. In the United States, these numbers are known as toll-free, in the rest of the world, they're known as freephone numbers. Since toll-free numbers were introduced, the demand for the service, basically a call-forwarding plan that reverses charges to the called party, has soared.