SIDNEY — MT
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | 3 |
| MID-RIVERS TELEPHONE COOPERATIVE, INC. | 7830 | 2 |
| LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | 2 |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 1 |
| QWEST CORPORATION | 9636 | 1 |