Phone numbers in Tecumseh, Michigan
Tecumseh has 7 phone prefixes in area code 517.
Biggest holders: Frontier, AT&T Mobility, TC3 Telecom. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 14%
- Local phone company 43%
- Internet / business phone carrier 29%
- Phone company 14%
Every prefix in Tecumseh
Search the first six digits of a number in this list. If it's here, the number started in Tecumseh with the carrier shown. If it isn't, check the Michigan page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 517-301 | AT&T Mobility | Mobile carrier | – |
| 517-423 | Frontier | Local phone company | – |
| 517-424 | Frontier | Local phone company | – |
| 517-470 | TC3 Telecom | Phone company | – |
| 517-809 | Interactive Services Network | Internet / business phone carrier | – |
| 517-815 | Frontier | Local phone company | – |
| 517-837 | TON80 Communications | Internet / business phone carrier | 2022 |
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.