FULLERTON — CA
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| PACIFIC BELL | 9740 | 20 |
| T-MOBILE USA, INC. | 6529 | 7 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 4 |
| METROPCS NETWORKS, LLC | 899D | 4 |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | 3 |