Phone numbers in Algoma, Wisconsin
Algoma has 5 phone prefixes in area codes 274, 920.
Biggest holders: AT&T (local phone), T-Mobile (including Sprint), AT&T Mobility. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 40%
- Local phone company 40%
- Internet / business phone carrier 20%
Every prefix in Algoma
Search the first six digits of a number in this list. If it's here, the number started in Algoma with the carrier shown. If it isn't, check the Wisconsin page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 274-203 | T-Mobile (including Sprint) | Mobile carrier | 2025 |
| 920-365 | AT&T (local phone) | Local phone company | 2001 |
| 920-487 | AT&T (local phone) | Local phone company | – |
| 920-708 | AT&T Mobility | Mobile carrier | 2022 |
| 920-880 | Peerless Network Of Wisconsin | Internet / business phone carrier | 2016 |
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.