CALMAR — IA
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| ONVOY, LLC - IA | 221F | 1 |
| ONVOY SPECTRUM, LLC | 624H | 1 |
| AT&T - LOCAL | 7421 | 1 |
| QWEST CORPORATION | 9631 | 1 |
Data last updated: March 10, 2026
| Carrier | OCN | NXX Count |
|---|---|---|
| ONVOY, LLC - IA | 221F | 1 |
| ONVOY SPECTRUM, LLC | 624H | 1 |
| AT&T - LOCAL | 7421 | 1 |
| QWEST CORPORATION | 9631 | 1 |