Phone numbers in Libby, Montana
Libby has 6 phone prefixes in area code 406.
Biggest holders: Ziply Fiber, AT&T Mobility, Verizon Wireless. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 50%
- Local phone company 33%
- Internet / business phone carrier 17%
Every prefix in Libby
Search the first six digits of a number in this list. If it's here, the number started in Libby with the carrier shown. If it isn't, check the Montana page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 406-283 | Ziply Fiber | Local phone company | – |
| 406-291 | Verizon Wireless | Mobile carrier | – |
| 406-293 | Ziply Fiber | Local phone company | – |
| 406-334 | AT&T Mobility | Mobile carrier | 2004 |
| 406-405 | Onvoy | Internet / business phone carrier | 2022 |
| 406-918 | AT&T Mobility | Mobile carrier | 2026 |
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.