Phone numbers in Kalkaska, Michigan
Kalkaska has 10 phone prefixes in area code 231.
Biggest holders: T-Mobile (including Sprint), AT&T Mobility, AT&T (local phone). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 50%
- Local phone company 10%
- Internet / business phone carrier 20%
- Paging service 10%
- Phone company 10%
Every prefix in Kalkaska
Search the first six digits of a number in this list. If it's here, the number started in Kalkaska with the carrier shown. If it isn't, check the Michigan page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 231-258 | AT&T (local phone) | Local phone company | – |
| 231-314 | Interactive Services Network | Internet / business phone carrier | – |
| 231-384 | Verizon Wireless | Mobile carrier | 2003 |
| 231-413 | T-Mobile (including Sprint) | Mobile carrier | 2022 |
| 231-518 | Level 3 (Lumen) | Internet / business phone carrier | 2001 |
| 231-564 | AT&T Mobility | Mobile carrier | – |
| 231-604 | Spok | Paging service | – |
| 231-624 | T-Mobile (including Sprint) | Mobile carrier | – |
| 231-656 | 123.NET | Phone company | 2002 |
| 231-886 | AT&T Mobility | Mobile carrier | – |
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.