Phone numbers in Berlin, Wisconsin
Berlin has 5 phone prefixes in area code 920.
Biggest holders: AT&T Mobility, Level 3 (Lumen), Brightspeed Of North Central Wisconsin. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 40%
- Local phone company 20%
- Internet / business phone carrier 40%
Every prefix in Berlin
Search the first six digits of a number in this list. If it's here, the number started in Berlin with the carrier shown. If it isn't, check the Wisconsin page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 920-290 | AT&T Mobility | Mobile carrier | – |
| 920-354 | Level 3 (Lumen) | Internet / business phone carrier | 2004 |
| 920-361 | Brightspeed Of North Central Wisconsin | Local phone company | – |
| 920-789 | AT&T Mobility | Mobile carrier | – |
| 920-914 | Charter / Spectrum | Internet / business phone carrier | 2022 |
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.