MONTELLO — WI
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 2 |
| FRONTIER NORTH INC. - WI | 0886 | 1 |
| ONVOY, LLC - WI | 225C | 1 |
Data last updated: June 25, 2026
| Carrier | OCN | NXX Count |
|---|---|---|
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 2 |
| FRONTIER NORTH INC. - WI | 0886 | 1 |
| ONVOY, LLC - WI | 225C | 1 |