10-10-321 is a United States long-distance phone service best known for its prolific television and direct mail advertising in the late 1990s. 10-10-321 was the first mass-marketed service of its type, and it and the similar 10-10-220 and 10-10-900 services were all owned by Telecom USA, which was owned by MCI. All services of its kind are known as interexchange carriers, which essentially allow consumers to bypass, or "dial-around" their primary long-distance carrier and use a different one.
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