Customer Service
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
Sales
Customer Service
E-mail
Voice-Only Solutions
1-800-436-4444
1-800-436-4444
Contact Us
MCI Business Complete
MCI Long Distance Services
Existing customers should have their account number available when calling.
Voice-Only Solutions