Phone numbers in Forsyth, Montana
Forsyth has 5 phone prefixes in area code 406.
Biggest holders: AT&T Mobility, Range Telephone Cooperative, Verizon Wireless. 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 Forsyth
Search the first six digits of a number in this list. If it's here, the number started in Forsyth with the carrier shown. If it isn't, check the Montana page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 406-201 | AT&T Mobility | Mobile carrier | 2003 |
| 406-346 | Range Telephone Cooperative | Local phone company | 2002 |
| 406-351 | Verizon Wireless | Mobile carrier | – |
| 406-356 | CenturyLink / Lumen | Local phone company | – |
| 406-416 | Onvoy | Internet / business phone carrier | 2020 |
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.