Phone numbers in Shaftsburg, Michigan
Shaftsburg has 3 phone prefixes in area code 517.
Biggest holders: Onvoy, Shiawassee Tel, Acd Telecom. This is the local calling area (rate center) where those prefixes were first assigned.
- Internet / business phone carrier 33%
- Phone company 67%
Every prefix in Shaftsburg
Search the first six digits of a number in this list. If it's here, the number started in Shaftsburg with the carrier shown. If it isn't, check the Michigan page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 517-274 | Onvoy | Internet / business phone carrier | 2021 |
| 517-675 | Shiawassee Tel | Phone company | – |
| 517-691 | Acd Telecom | Phone company | 2002 |
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.