10-10-321
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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. 10-10-321 was the first mass-marketed service of its type. 10-10-345 was owned by AT&T, and the rest were all owned by Telecom USA, which was owned by MCI; MCI is now part of Verizon. 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.