Phone numbers in Keystone Heights, Florida
Keystone Heights has 7 phone prefixes in area code 352.
Biggest holders: T-Mobile (including Sprint), Onvoy, AT&T (local phone). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 29%
- Local phone company 14%
- Internet / business phone carrier 57%
Every prefix in Keystone Heights
Search the first six digits of a number in this list. If it's here, the number started in Keystone Heights with the carrier shown. If it isn't, check the Florida page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 352-235 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 352-473 | AT&T (local phone) | Local phone company | – |
| 352-478 | T-Mobile (including Sprint) | Mobile carrier | – |
| 352-639 | Bandwidth | Internet / business phone carrier | 2010 |
| 352-645 | Onvoy | Internet / business phone carrier | 2019 |
| 352-837 | TON80 Communications | Internet / business phone carrier | 2021 |
| 352-880 | Onvoy | Internet / business phone carrier | 2024 |
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.