DETROITZN4 — MI
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| MICHIGAN BELL TEL CO | 9323 | 26 |
| OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | 12 |
| AMERICAN MESSAGING SERVICES, LLC | 9748 | 8 |
| BANDWIDTH.COM CLEC, LLC - MI | 991E | 5 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7279 | 4 |