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Customer Service

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.

Service Numbers
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Voice-Only Solutions
  • MCI Business Complete
  • MCI Long Distance Services
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Former TTI National customers 1-800-893-5094
Voice-Only Solutions 1-800-893-5094
Existing customers should have their account number available when calling.

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