BILLINGS — MT
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| QWEST CORPORATION | 9636 | 18 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | 12 |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 7 |
| ONVOY, LLC - MT | 453F | 4 |
| ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 4222 | 3 |