MCI Inc.

==Long Distance Discount Services==
===1983–1995===
==LDDS WorldCom==
===1995–1998===
==MCI WorldCom==
===1998–2000===
==WorldCom==
===2000–2003===
==MCI==
===2003–2006===
Category:Verizon Communications
Category:Telecommunications
Category:Telephone companies
Category:Telecommunications companies
Category:Defunct
Category:Defunct telecommunications companies
Category:Defunct telecommunications companies in the United States
Category:Telecommunications companies in the United States
Category:Ashburn, Virginia
Category:Virginia
Category:United States
Category:1980s
Category:1983