1-800-444-3333
(open 7 a.m. - 10 p.m. ET)
1-800-444-1111
(major accounts customer service)
1-800-950-5555
1-800-754-7076
1-800-999-1909
(MCI Aadvantage Members)
1-888-663-7823
(MCI Major National Accounts, billing and technical, 24/7)
1-800-677-6580
(Consumer Executive Assistance, M-F, 9:30 a.m. - 5:30 p.m. ET)
Warning About MCI Rate Plans MCI has a history of failing to notify its customers on a timely basis of changes to its rate plans. As a result, every aspect of MCI's rate plans provided on this web site should be considered suspect.
Be sure to check MCI's currently-available residential long-distance plans.