GREATFALLS — MT
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| QWEST CORPORATION | 9636 | 11 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | 6 |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 3 |
| ONVOY, LLC - MT | 453F | 2 |
| LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | 2 |