Phone numbers in Underwood, Iowa
Underwood has 3 phone prefixes in area code 712.
Biggest holders: Onvoy, Airus, CenturyLink / Lumen. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 33%
- Internet / business phone carrier 33%
- Phone company 33%
Every prefix in Underwood
Search the first six digits of a number in this list. If it's here, the number started in Underwood with the carrier shown. If it isn't, check the Iowa page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 712-201 | Onvoy | Internet / business phone carrier | 2015 |
| 712-543 | Airus | Phone company | 2019 |
| 712-566 | CenturyLink / Lumen | Local phone company | – |
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.