Phone numbers in Calumet, Michigan
Calumet has 5 phone prefixes in area code 906.
Biggest holders: AT&T (local phone), Range Telecommunications, AT&T Mobility. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 20%
- Local phone company 40%
- Internet / business phone carrier 20%
- Phone company 20%
Every prefix in Calumet
Search the first six digits of a number in this list. If it's here, the number started in Calumet with the carrier shown. If it isn't, check the Michigan page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 906-303 | Range Telecommunications | Phone company | – |
| 906-337 | AT&T (local phone) | Local phone company | – |
| 906-369 | AT&T Mobility | Mobile carrier | – |
| 906-729 | Vonage America | Internet / business phone carrier | 2018 |
| 906-934 | AT&T (local phone) | Local phone company | 2001 |
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.