Phone numbers in Armstrong, Iowa
Armstrong has 3 phone prefixes in area code 712.
Biggest holders: Windstream Iowa Communications, Inc. - North, Independent Networks. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 67%
- Phone company 33%
Every prefix in Armstrong
Search the first six digits of a number in this list. If it's here, the number started in Armstrong with the carrier shown. If it isn't, check the Iowa page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 712-206 | Windstream Iowa Communications, Inc. - North | Local phone company | 2018 |
| 712-864 | Windstream Iowa Communications, Inc. - North | Local phone company | – |
| 712-868 | Independent Networks | 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.