SIERRAVIST — AZ
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ | 7465 | 20 |
| QWEST CORPORATION | 9636 | 12 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 7217 | 10 |
| T-MOBILE USA, INC. | 6529 | 8 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | 5 |