CICERO — IL
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 7 |
| ILLINOIS BELL TEL CO | 9329 | 5 |
| ONVOY, LLC | 224C | 4 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 3 |
| METROPCS, INC. | 5562 | 2 |