MAMMOTHLKS — CA
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| FRONTIER CALIFORNIA INC. | 4420 | 2 |
| ONVOY, LLC - CA | 649C | 2 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 1 |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 1 |
| LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | 1 |