Phone numbers in Hart, Michigan
Hart has 7 phone prefixes in area code 231.
Biggest holders: Verizon Wireless, Twilio, 123.NET. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 43%
- Local phone company 14%
- Internet / business phone carrier 29%
- Phone company 14%
Every prefix in Hart
Search the first six digits of a number in this list. If it's here, the number started in Hart with the carrier shown. If it isn't, check the Michigan page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 231-301 | Verizon Wireless | Mobile carrier | – |
| 231-594 | Twilio | Internet / business phone carrier | – |
| 231-721 | 123.NET | Phone company | 2002 |
| 231-742 | AT&T Mobility | Mobile carrier | – |
| 231-873 | Frontier | Local phone company | – |
| 231-902 | Interactive Services Network | Internet / business phone carrier | 2001 |
| 231-923 | T-Mobile (including Sprint) | Mobile carrier | 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.