Phone numbers in St. Regis, Montana
St. Regis has 3 phone prefixes in area code 406.
Biggest holders: AT&T Mobility, Blackfoot Tel. Coop. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 67%
- Phone company 33%
Every prefix in St. Regis
Search the first six digits of a number in this list. If it's here, the number started in St. Regis with the carrier shown. If it isn't, check the Montana page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 406-269 | AT&T Mobility | Mobile carrier | 2010 |
| 406-280 | AT&T Mobility | Mobile carrier | 2003 |
| 406-649 | Blackfoot Tel. Coop | 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.