Phone numbers in Window Rock, Arizona
Window Rock has 6 phone prefixes in area code 928.
Biggest holders: Frontier, Cellular One Of Ne Arizona, Level 3 (Lumen). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 17%
- Local phone company 50%
- Internet / business phone carrier 33%
Every prefix in Window Rock
Search the first six digits of a number in this list. If it's here, the number started in Window Rock with the carrier shown. If it isn't, check the Arizona page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 928-309 | Cellular One Of Ne Arizona | Mobile carrier | – |
| 928-357 | Level 3 (Lumen) | Internet / business phone carrier | 2019 |
| 928-407 | Telnyx | Internet / business phone carrier | 2021 |
| 928-810 | Frontier | Local phone company | – |
| 928-815 | Frontier | Local phone company | 2011 |
| 928-871 | Frontier | 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.