PLEASANTON — CA
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| PACIFIC BELL | 9740 | 28 |
| T-MOBILE USA, INC. | 6529 | 10 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 6 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 6 |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | 5 |