Service Numbers
If you'd like to speak directly with an MCI Customer Service Representative, call the toll-free number that applies to the product that interests you.
Contact Us
Customer Service
E-mail
Voice-Only Solutions
MCI Business Complete
MCI Long Distance Services
1-800-436-4444
Contact Us
Former TTI National customers
1-800-893-5094
www.mci.com
Voice-Only Solutions
1-800-893-5094
www.mci.com
Existing customers should have their account number available when calling.
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