Phone numbers in Crockett, California
Crockett has 10 phone prefixes in area codes 341, 510.
Biggest holders: Bandwidth, Fractel, Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 10%
- Local phone company 10%
- Internet / business phone carrier 80%
Every prefix in Crockett
Search the first six digits of a number in this list. If it's here, the number started in Crockett with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 341-444 | Fractel | Internet / business phone carrier | 2019 |
| 341-867 | Onvoy | Internet / business phone carrier | 2025 |
| 341-900 | Fractel | Internet / business phone carrier | 2020 |
| 510-256 | Bandwidth | Internet / business phone carrier | – |
| 510-312 | Commio | Internet / business phone carrier | 2023 |
| 510-455 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 510-722 | Bandwidth | Internet / business phone carrier | – |
| 510-726 | Peerless Network Of California | Internet / business phone carrier | 2016 |
| 510-787 | AT&T (local phone) | Local phone company | – |
| 510-937 | Bandwidth | Internet / business phone carrier | 2015 |
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.