- Yahoo Finance
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.
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MCI, Inc. of United States provides telecommunication services. The Company offers tele-calling, internet, data, and managed network services. MCI serves customers internationally.
MCI Careers. Find out what works well at MCI Careers from the people who know best. Get the inside scoop on jobs, salaries, top office locations, and CEO insights. Compare pay for popular roles and read about the team’s work-life balance.