VISTA — CA
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| PACIFIC BELL | 9740 | 18 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 15 |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 12 |
| T-MOBILE USA, INC. | 6529 | 6 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | 4 |