SUMMIT — IL
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 8 |
| ILLINOIS BELL TEL CO | 9329 | 6 |
| T-MOBILE USA, INC. | 6529 | 3 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | 3 |
| METROPCS, INC. | 5562 | 2 |