Phone numbers in Mountaincy, Tennessee
Mountaincy has 6 phone prefixes in area code 423.
Biggest holders: T-Mobile (including Sprint), Bandwidth, AT&T Mobility. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 50%
- Local phone company 17%
- Internet / business phone carrier 17%
- Phone company 17%
Every prefix in Mountaincy
Search the first six digits of a number in this list. If it's here, the number started in Mountaincy with the carrier shown. If it isn't, check the Tennessee page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 423-291 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 423-460 | Bandwidth | Internet / business phone carrier | 2010 |
| 423-471 | AT&T Mobility | Mobile carrier | 2003 |
| 423-501 | Skybest Communications | Phone company | 2017 |
| 423-727 | CenturyLink / Lumen | Local phone company | – |
| 423-841 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
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.