Phone numbers in Nephi, Utah
Nephi has 8 phone prefixes in area code 435.
Biggest holders: Verizon Wireless, Bandwidth, Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 50%
- Local phone company 12%
- Internet / business phone carrier 38%
Every prefix in Nephi
Search the first six digits of a number in this list. If it's here, the number started in Nephi with the carrier shown. If it isn't, check the Utah page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 435-250 | Bandwidth | Internet / business phone carrier | – |
| 435-417 | Onvoy | Internet / business phone carrier | – |
| 435-580 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 435-610 | Verizon Wireless | Mobile carrier | – |
| 435-623 | CenturyLink / Lumen | Local phone company | – |
| 435-660 | Verizon Wireless | Mobile carrier | – |
| 435-681 | AT&T Mobility | Mobile carrier | – |
| 435-856 | Level 3 (Lumen) | Internet / business phone carrier | 2001 |
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.