MCI Inc.
Telecommunications company
MCI, Inc. was a telecommunications company. For a time, it was the second-largest long-distance telephone company in the United States, after AT&T. Wikipedia
Customer service: 1 (888) 624-5622
Founders: Bernard Ebbers, William G. McGowan, and John D. Goeken
Ceased operations: 2006
Parent organization: Verizon
Headquarters: Ashburn, VA
Date founded: 1983
Formerly: Long Distance Discount Services (1983–1995); WorldCom (1995–1998, 2000–2003); MCI WorldCom (1998–2000); MCI (2003–2006)