What is the SMS800 and what function does it serve?

By law, all toll free phone service providers must deal with SMS/800 while assigning or reserving numbers for their customers. SMS/800 keeps records on the status of all 800 numbers, service providers, and call routing options.
The popularity of the 1-800 number, launched in 1967, led the Federal Communications Commission (FCC) to add the new pre-fixes 888 and 877 in the mid-1990s. When availability of those numbers plummeted, 866 was added in 2000 to overcome the shortage. SMS/800, started in the mid-1980s, manages all these numbers.

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