WESTMINSTR — CA
Data last updated: October 30, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 43 |
| FRONTIER CALIFORNIA INC. | 2319 | 17 |
| T-MOBILE USA, INC. | 6529 | 16 |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 7 |
| ONVOY, LLC - CA | 649C | 4 |