Phone numbers in Howell, Michigan
Howell has 27 phone prefixes in area code 517.
Biggest holders: AT&T (local phone), AT&T Mobility, T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 37%
- Local phone company 19%
- Internet / business phone carrier 41%
- Paging service 4%
Every prefix in Howell
Search the first six digits of a number in this list. If it's here, the number started in Howell with the carrier shown. If it isn't, check the Michigan page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 517-225 | AT&T Mobility | Mobile carrier | 2015 |
| 517-234 | AT&T Mobility | Mobile carrier | 2016 |
| 517-258 | Bandwidth | Internet / business phone carrier | 2012 |
| 517-273 | Teleport Communications America | Internet / business phone carrier | 2017 |
| 517-292 | Teleport Communications America | Internet / business phone carrier | – |
| 517-295 | Bandwidth | Internet / business phone carrier | 2013 |
| 517-304 | AT&T Mobility | Mobile carrier | – |
| 517-338 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 517-376 | Comcast | Internet / business phone carrier | – |
| 517-380 | T-Mobile (including Sprint) | Mobile carrier | 2024 |
| 517-404 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 517-518 | AT&T Mobility | Mobile carrier | 2002 |
| 517-537 | Onvoy | Internet / business phone carrier | 2021 |
| 517-540 | AT&T (local phone) | Local phone company | – |
| 517-545 | AT&T (local phone) | Local phone company | – |
| 517-546 | AT&T (local phone) | Local phone company | – |
| 517-548 | AT&T (local phone) | Local phone company | – |
| 517-552 | AT&T (local phone) | Local phone company | – |
| 517-553 | MetroPCS (T-Mobile) | Mobile carrier | 2021 |
| 517-571 | Spok | Paging service | – |
| 517-579 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 517-586 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 517-618 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 517-672 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 517-798 | T-Mobile (including Sprint) | Mobile carrier | 2010 |
| 517-861 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 517-947 | Interactive Services Network | Internet / business phone 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.