Phone numbers in Charlevoix, Michigan
Charlevoix has 7 phone prefixes in area code 231.
Biggest holders: AT&T (local phone), T-Mobile (including Sprint), Bandwidth. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 29%
- Local phone company 29%
- Internet / business phone carrier 29%
- Phone company 14%
Every prefix in Charlevoix
Search the first six digits of a number in this list. If it's here, the number started in Charlevoix with the carrier shown. If it isn't, check the Michigan page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 231-237 | AT&T (local phone) | Local phone company | – |
| 231-289 | Bandwidth | Internet / business phone carrier | 2018 |
| 231-308 | Interactive Services Network | Internet / business phone carrier | – |
| 231-437 | T-Mobile (including Sprint) | Mobile carrier | – |
| 231-520 | 123.NET | Phone company | 2002 |
| 231-547 | AT&T (local phone) | Local phone company | – |
| 231-552 | T-Mobile (including Sprint) | Mobile carrier | 2025 |
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.