DE KALB — IL
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| FRONTIER NORTH, INC. - IL | 1036 | 7 |
| UNITED STATES CELLULAR - IL | 6265 | 4 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 4 |
| T-MOBILE USA, INC. | 6529 | 4 |
| ONVOY, LLC | 224C | 2 |