Phone numbers in Somerton, Arizona
Somerton has 16 phone prefixes in area code 928.
Biggest holders: Onvoy, Verizon Wireless, T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 31%
- Local phone company 19%
- Internet / business phone carrier 44%
- Phone company 6%
Every prefix in Somerton
Search the first six digits of a number in this list. If it's here, the number started in Somerton with the carrier shown. If it isn't, check the Arizona page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 928-236 | Onvoy | Internet / business phone carrier | 2016 |
| 928-285 | AT&T (local phone) | Local phone company | 2012 |
| 928-315 | T-Mobile (including Sprint) | Mobile carrier | 2007 |
| 928-323 | Level 3 (Lumen) | Internet / business phone carrier | 2012 |
| 928-390 | Verizon Wireless | Mobile carrier | 2022 |
| 928-398 | Onvoy | Internet / business phone carrier | 2020 |
| 928-430 | IP Horizon | Internet / business phone carrier | 2021 |
| 928-504 | Onvoy | Internet / business phone carrier | – |
| 928-510 | Verizon Wireless | Mobile carrier | 2023 |
| 928-512 | Allo Communications | Phone company | 2023 |
| 928-550 | T-Mobile (including Sprint) | Mobile carrier | 2005 |
| 928-627 | CenturyLink / Lumen | Local phone company | – |
| 928-655 | Verizon Wireless | Mobile carrier | 2018 |
| 928-722 | CenturyLink / Lumen | Local phone company | 2002 |
| 928-843 | TON80 Communications | Internet / business phone carrier | 2022 |
| 928-928 | Onvoy | Internet / business phone carrier | 2022 |
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.