Phone numbers in Sister Bay, Wisconsin
Sister Bay has 3 phone prefixes in area code 920.
Biggest holders: Bug Tussel Wireless, Onvoy, Frontier. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 33%
- Local phone company 33%
- Internet / business phone carrier 33%
Every prefix in Sister Bay
Search the first six digits of a number in this list. If it's here, the number started in Sister Bay with the carrier shown. If it isn't, check the Wisconsin page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 920-633 | Bug Tussel Wireless | Mobile carrier | 2009 |
| 920-673 | Onvoy | Internet / business phone carrier | 2021 |
| 920-854 | Frontier | Local phone company | – |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number. Source: NANPA central office code records, 2026-10-10.