Phone numbers in Portage, Wisconsin
Portage has 9 phone prefixes in area code 608.
Biggest holders: UScellular, Frontier, T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 56%
- Local phone company 22%
- Internet / business phone carrier 22%
Every prefix in Portage
Search the first six digits of a number in this list. If it's here, the number started in Portage with the carrier shown. If it isn't, check the Wisconsin page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 608-566 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 608-617 | UScellular | Mobile carrier | 2001 |
| 608-683 | Verizon Wireless | Mobile carrier | 2012 |
| 608-686 | Onvoy | Internet / business phone carrier | 2020 |
| 608-697 | UScellular | Mobile carrier | – |
| 608-742 | Frontier | Local phone company | – |
| 608-745 | Frontier | Local phone company | – |
| 608-810 | Level 3 (Lumen) | Internet / business phone carrier | 2021 |
| 608-970 | MetroPCS (T-Mobile) | Mobile carrier | 2025 |
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.