SANDWICH — IL
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| FRONTIER NORTH, INC. - IL | 1015 | 2 |
| PEERLESS NETWORK OF ILLINOIS, LLC - IL | 063E | 1 |
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 1 |
| UNITED STATES CELLULAR - IL | 6265 | 1 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 1 |