COLBY — WI
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | 2 |
| FRONTIER NORTH INC. - WI | 0886 | 1 |
| ONVOY, LLC - WI | 225C | 1 |
| TON80 COMMUNICATIONS, LLC | 516J | 1 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 1 |