Phone numbers in Colstrip, Montana
Colstrip has 5 phone prefixes in area code 406.
Biggest holders: Verizon Wireless, Level 3 (Lumen), CenturyLink / Lumen. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 60%
- Local phone company 20%
- Internet / business phone carrier 20%
Every prefix in Colstrip
Search the first six digits of a number in this list. If it's here, the number started in Colstrip with the carrier shown. If it isn't, check the Montana page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 406-213 | Level 3 (Lumen) | Internet / business phone carrier | 2003 |
| 406-720 | Verizon Wireless | Mobile carrier | – |
| 406-740 | Verizon Wireless | Mobile carrier | – |
| 406-748 | CenturyLink / Lumen | Local phone company | – |
| 406-749 | AT&T Mobility | Mobile carrier | – |
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.