10-10-321

10-10-321, 10-10-345, 10-10-220, and 10-10-987 are United States long-distance phone services best known for their prolific television and direct mail advertising in the late 1990s.

[2] Although "dial-around" interexchange carriers existed prior to the debut of 10-10-321, these were among the first to feature a mass multimedia advertising campaign.

The services were advertised heavily, using celebrities such as Hulk Hogan, ALF, John Lithgow, Terry Bradshaw, Reginald VelJohnson, John Stamos, Mike Piazza, Tony Danza, Doug Flutie, James Garner, Toby Keith, Christopher Lloyd, Dennis Miller and George Carlin.

This ubiquitous presence on television led to a spill-over into pop culture for a brief time, much like 1-800-COLLECT, a collect call service also owned by MCI, during this era.

A year earlier, a 9.9 percent "Universal Service Fund" charge had been added.