All MCI Communications support phone numbers are listed below, including customer service phone number(s), support phone number(s), support phone number(s), support phone number(s), etc. You can also get MCI Communications support via email, social networks, help center, or directly check all the customer service contacts of MCI Communications.
| Customer Service number | +1 800 444 3333 |
|
Customer Service number
(Local) |
+1 888 624 5622 |
| Customer Service number | +1 800 444 2222 |
|
Customer Service number
(Former Tti National Customers) |
+1 800 893 5094 |
| Customer Service number | +1 800 242 7070 |
| Customer Service number | +1 800 540 3598 |
| Customer Service number | +1 800 921 0089 |
MCI Communications Overview
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, D.C.[1]
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, with the name afterwards being shortened to WorldCom in 2000. WorldCom's financial scandals and bankruptcy led that company to change its name in 2003 to MCI Inc. The MCI name disappeared in January 2006 after the company was bought by Verizon.
| Industry | Telecommunications |
| Headquarters | Washington, DC |
| Company size | 10,001+ employees |