Phone numbers in Alto, Michigan
Alto has 5 phone prefixes in area code 616.
Biggest holders: Csc Wireless, Onvoy, MCImetro (Verizon Business). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 20%
- Local phone company 20%
- Internet / business phone carrier 60%
Every prefix in Alto
Search the first six digits of a number in this list. If it's here, the number started in Alto with the carrier shown. If it isn't, check the Michigan page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 616-276 | Csc Wireless | Mobile carrier | 2020 |
| 616-420 | Onvoy | Internet / business phone carrier | 2009 |
| 616-622 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 616-868 | AT&T (local phone) | Local phone company | – |
| 616-898 | Twilio | Internet / business phone carrier | 2021 |
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.