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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
Parent organization: Verizon
Ceased operations: 2006
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)
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Feb 13, 2024 · Mild cognitive impairment (MCI) is the stage between the expected decline in memory and thinking that happens with age and the more serious ...