Phone numbers in Helena, Montana
Helena has 38 phone prefixes in area code 406.
Biggest holders: CenturyLink / Lumen, Verizon Wireless, Charter / Spectrum. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 29%
- Local phone company 42%
- Internet / business phone carrier 26%
- Phone company 3%
Every prefix in Helena
Search the first six digits of a number in this list. If it's here, the number started in Helena with the carrier shown. If it isn't, check the Montana page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 406-202 | AT&T Mobility | Mobile carrier | 2001 |
| 406-204 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 406-227 | CenturyLink / Lumen | Local phone company | – |
| 406-324 | CenturyLink / Lumen | Local phone company | – |
| 406-389 | CenturyLink / Lumen | Local phone company | 2013 |
| 406-410 | Verizon Wireless | Mobile carrier | – |
| 406-417 | AT&T Mobility | Mobile carrier | 2008 |
| 406-422 | Charter / Spectrum | Internet / business phone carrier | – |
| 406-430 | Onvoy | Internet / business phone carrier | – |
| 406-431 | Verizon Wireless | Mobile carrier | – |
| 406-437 | MCImetro (Verizon Business) | Internet / business phone carrier | 2004 |
| 406-438 | Verizon Wireless | Mobile carrier | 2014 |
| 406-439 | AT&T Mobility | Mobile carrier | – |
| 406-440 | 3 Rivers Telephone Cooperative | Local phone company | 2005 |
| 406-441 | CenturyLink / Lumen | Local phone company | – |
| 406-442 | CenturyLink / Lumen | Local phone company | – |
| 406-443 | CenturyLink / Lumen | Local phone company | – |
| 406-444 | CenturyLink / Lumen | Local phone company | – |
| 406-447 | CenturyLink / Lumen | Local phone company | – |
| 406-449 | CenturyLink / Lumen | Local phone company | – |
| 406-457 | CenturyLink / Lumen | Local phone company | – |
| 406-458 | CenturyLink / Lumen | Local phone company | – |
| 406-459 | Verizon Wireless | Mobile carrier | – |
| 406-461 | Verizon Wireless | Mobile carrier | – |
| 406-465 | Verizon Wireless | Mobile carrier | – |
| 406-475 | CenturyLink / Lumen | Local phone company | – |
| 406-495 | CenturyLink / Lumen | Local phone company | – |
| 406-502 | Charter / Spectrum | Internet / business phone carrier | 2012 |
| 406-513 | Charter / Spectrum | Internet / business phone carrier | 2008 |
| 406-558 | MCImetro (Verizon Business) | Internet / business phone carrier | 2002 |
| 406-594 | Verizon Wireless | Mobile carrier | – |
| 406-603 | Blackfoot Communications | Phone company | 2013 |
| 406-634 | Onvoy | Internet / business phone carrier | – |
| 406-841 | CenturyLink / Lumen | Local phone company | – |
| 406-916 | T-Mobile (including Sprint) | Mobile carrier | 2017 |
| 406-933 | CenturyLink / Lumen | Local phone company | – |
| 406-992 | Onvoy | Internet / business phone carrier | 2008 |
| 406-996 | Charter / Spectrum | Internet / business phone carrier | 2011 |
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.