Phone numbers in Dillon, Montana
Dillon has 7 phone prefixes in area code 406.
Biggest holders: AT&T Mobility, Verizon Wireless, Level 3 (Lumen). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 57%
- Local phone company 14%
- Internet / business phone carrier 29%
Every prefix in Dillon
Search the first six digits of a number in this list. If it's here, the number started in Dillon with the carrier shown. If it isn't, check the Montana page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 406-596 | AT&T Mobility | Mobile carrier | – |
| 406-660 | AT&T Mobility | Mobile carrier | – |
| 406-683 | CenturyLink / Lumen | Local phone company | – |
| 406-865 | Verizon Wireless | Mobile carrier | – |
| 406-925 | Verizon Wireless | Mobile carrier | – |
| 406-960 | Level 3 (Lumen) | Internet / business phone carrier | 2003 |
| 406-988 | Level 3 (Lumen) | Internet / business phone carrier | 2005 |
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.