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MCI, Inc. (formerly WorldCom and MCI WorldCom) was a telecommunications company. For a time, it was the second-largest long-distance telephone company in the United States, after AT&T.
Global business and residential communications company operating in more than 65 countries.
Welcome to MCI. We offer Residential & Small Business Local and Long Distance, SkyTel Messaging, Prepaid Calling Services, Internet Wholesale, and Telecommunications Wholesale Services.
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MCI offers many easy ways to pay your bill. Choose the solution that's best for you: Instant Payment or automatic payment with paper or online statement (saves $1 off your bill every month). It's your choice! See options below. For MCI Business Complete customers, paying your phone bill has never been easier.
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MCI, Inc. (subsequently Worldcom and MCI WorldCom) was a telecommunications company. WorldCom was originally headquartered in Clinton, Mississippi before relocating to Ashburn, Virginia when it changed its name to MCI.