MCI Communications

MCI Communications Corp. was an American telecommunications company that was instrumental in legal and regulatory changes that led to the breakup of the AT&T; monopoly of American telephony and ushered in the competitive long distance telephone industry. It was headquartered in Washington, DC. Founded in 1963, it grew to be the second largest long-distance provider in the U.S. It was purchased by WorldCom in 1998 and became MCI WorldCom, and afte... more
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