Phone numbers in Johnston, South Carolina
Johnston has 8 phone prefixes in area codes 803, 839.
Biggest holders: Verizon Wireless, AT&T Mobility, AT&T (local phone). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 75%
- Local phone company 12%
- Internet / business phone carrier 12%
Every prefix in Johnston
Search the first six digits of a number in this list. If it's here, the number started in Johnston with the carrier shown. If it isn't, check the South Carolina page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 803-275 | AT&T (local phone) | Local phone company | – |
| 803-334 | AT&T Mobility | Mobile carrier | 2002 |
| 803-430 | AT&T Mobility | Mobile carrier | 2005 |
| 803-480 | Verizon Wireless | Mobile carrier | – |
| 803-618 | Verizon Wireless | Mobile carrier | 2013 |
| 803-710 | Verizon Wireless | Mobile carrier | 2017 |
| 839-247 | Verizon Wireless | Mobile carrier | 2023 |
| 839-900 | Fractel | Internet / business phone carrier | 2020 |
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.