HOLLY — MI
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| METROPCS, INC. | 5562 | 5 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | 4 |
| ONVOY, LLCV - MI | 543C | 3 |
| LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | 3 |
| MICHIGAN BELL TEL CO | 9323 | 2 |