MCI Long Distance Customer Service Numbers

  1. Inquires: 1-800-937-6000

  2. Alternative: +1-800-444-1111

  3. Head Office Location: 1300 I Street, North West Suite 400 West, Washington, District of Columbia 20005, United States
  4. Driving Direction: Follow the directions to locate MCI Long Distance
  5. Send Message at:
  6. Locations Near You: Find nearby locations of MCI Long Distance

For Any Enquiry/Inquiry and Customer Service Support
Service Support: You can avail service support from MCI Long Distance by following the given path.

What is MCI Long Distance in the Process of?

MCI is considered as one of the prominent residential voice, advanced messaging and commercial telecommunications services providing company in the United States. MCI Long Distance had started its business as Long Distance Discount Services, Inc. , abbreviated as LDDS in 1983, in Clinton, Mississippi to offers wide range of long distance data plans. MCI Long Distance provided the first single mode fiber optic cable network to deliver the standard carrier in America telecommunication. MCI Long Distance is a operating unit of WorldCom, Inc.