Phone numbers in Charleston, Tennessee
Charleston has 9 phone prefixes in area code 423.
Biggest holders: T-Mobile (including Sprint), Teleport Communications America, AT&T (local phone). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 44%
- Local phone company 22%
- Internet / business phone carrier 33%
Every prefix in Charleston
Search the first six digits of a number in this list. If it's here, the number started in Charleston with the carrier shown. If it isn't, check the Tennessee page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 423-219 | Teleport Communications America | Internet / business phone carrier | 2019 |
| 423-336 | AT&T (local phone) | Local phone company | – |
| 423-665 | Level 3 (Lumen) | Internet / business phone carrier | 2004 |
| 423-780 | AT&T (local phone) | Local phone company | – |
| 423-810 | Teleport Communications America | Internet / business phone carrier | 2015 |
| 423-829 | AT&T Mobility | Mobile carrier | – |
| 423-898 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 423-951 | T-Mobile (including Sprint) | Mobile carrier | 2024 |
| 423-996 | T-Mobile (including Sprint) | Mobile carrier | 2025 |
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.