Phone numbers in Great Falls, Montana
Great Falls has 37 phone prefixes in area code 406.
Biggest holders: CenturyLink / Lumen, Verizon Wireless, AT&T Mobility. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 32%
- Local phone company 32%
- Internet / business phone carrier 27%
- Phone company 8%
Every prefix in Great Falls
Search the first six digits of a number in this list. If it's here, the number started in Great Falls with the carrier shown. If it isn't, check the Montana page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 406-205 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 406-216 | 3 Rivers Telephone Cooperative | Local phone company | – |
| 406-217 | Verizon Wireless | Mobile carrier | – |
| 406-231 | AT&T Mobility | Mobile carrier | 2001 |
| 406-268 | CenturyLink / Lumen | Local phone company | – |
| 406-315 | Sagebrush Cellular | Mobile carrier | – |
| 406-401 | Csc Wireless | Mobile carrier | 2019 |
| 406-402 | T-Mobile (including Sprint) | Mobile carrier | 2017 |
| 406-403 | Onvoy | Internet / business phone carrier | 2006 |
| 406-452 | CenturyLink / Lumen | Local phone company | – |
| 406-453 | CenturyLink / Lumen | Local phone company | – |
| 406-454 | CenturyLink / Lumen | Local phone company | – |
| 406-455 | CenturyLink / Lumen | Local phone company | – |
| 406-564 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 406-590 | Verizon Wireless | Mobile carrier | – |
| 406-604 | Blackfoot Communications | Phone company | 2011 |
| 406-727 | CenturyLink / Lumen | Local phone company | – |
| 406-731 | Wavenation | Phone company | – |
| 406-750 | Verizon Wireless | Mobile carrier | 2005 |
| 406-760 | Vonage America | Internet / business phone carrier | – |
| 406-761 | CenturyLink / Lumen | Local phone company | – |
| 406-770 | Comcast | Internet / business phone carrier | – |
| 406-771 | CenturyLink / Lumen | Local phone company | – |
| 406-781 | Verizon Wireless | Mobile carrier | – |
| 406-788 | Verizon Wireless | Mobile carrier | – |
| 406-791 | CenturyLink / Lumen | Local phone company | – |
| 406-799 | AT&T Mobility | Mobile carrier | – |
| 406-836 | Onvoy | Internet / business phone carrier | – |
| 406-866 | CenturyLink / Lumen | Local phone company | – |
| 406-868 | Verizon Wireless | Mobile carrier | – |
| 406-870 | Bandwidth | Internet / business phone carrier | – |
| 406-878 | Nuso | Internet / business phone carrier | 2013 |
| 406-899 | AT&T Mobility | Mobile carrier | – |
| 406-923 | Commio | Internet / business phone carrier | – |
| 406-952 | Onvoy | Internet / business phone carrier | – |
| 406-964 | CenturyLink / Lumen | Local phone company | – |
| 406-965 | Airus | 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.