OOSTBURG — WI
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | 2 |
| FRONTIER NORTH INC. - WI | 0886 | 1 |
| T-MOBILE USA, INC. | 6529 | 1 |
Data last updated: June 25, 2026
| Carrier | OCN | NXX Count |
|---|---|---|
| LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | 2 |
| FRONTIER NORTH INC. - WI | 0886 | 1 |
| T-MOBILE USA, INC. | 6529 | 1 |