BARSTOW — CA
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| FRONTIER CALIFORNIA INC. | 4420 | 5 |
| T-MOBILE USA, INC. | 6529 | 3 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 2 |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 2 |
| ONVOY, LLC - CA | 649C | 2 |