FONDDU LAC — WI
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| WISCONSIN BELL INC | 9327 | 9 |
| UNITED STATES CELLULAR - WI | 6274 | 5 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI | 6508 | 4 |
| T-MOBILE USA, INC. | 6529 | 3 |
| TDS METROCOM, LLC | 520K | 2 |