Phone numbers in Dulzura, California
Dulzura has 9 phone prefixes in area codes 619, 858.
Biggest holders: Teleport Communications America, Tpx Communications, AT&T (local phone). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 11%
- Local phone company 11%
- Internet / business phone carrier 56%
- Phone company 22%
Every prefix in Dulzura
Search the first six digits of a number in this list. If it's here, the number started in Dulzura with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 619-268 | Teleport Communications America | Internet / business phone carrier | – |
| 619-345 | Tpx Communications | Internet / business phone carrier | 2001 |
| 619-468 | AT&T (local phone) | Local phone company | – |
| 619-492 | Onvoy | Internet / business phone carrier | – |
| 619-625 | Bandwidth | Internet / business phone carrier | – |
| 619-774 | North County Communication | Phone company | – |
| 619-826 | AT&T Enterprises | Phone company | 2011 |
| 619-975 | AT&T Mobility | Mobile carrier | 2021 |
| 858-317 | Commio | Internet / business phone 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.