Phone numbers in Belvedere, California
Belvedere has 25 phone prefixes in area codes 415, 628.
Biggest holders: T-Mobile (including Sprint), Fractel, Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 44%
- Local phone company 8%
- Internet / business phone carrier 44%
- Phone company 4%
Every prefix in Belvedere
Search the first six digits of a number in this list. If it's here, the number started in Belvedere with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 415-316 | T-Mobile (including Sprint) | Mobile carrier | 2011 |
| 415-366 | Onvoy | Internet / business phone carrier | – |
| 415-435 | AT&T (local phone) | Local phone company | – |
| 415-619 | T-Mobile (including Sprint) | Mobile carrier | 2015 |
| 415-690 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 415-691 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 415-712 | Bandwidth | Internet / business phone carrier | 2013 |
| 415-789 | AT&T (local phone) | Local phone company | – |
| 415-797 | T-Mobile (including Sprint) | Mobile carrier | – |
| 415-889 | Teleport Communications America | Internet / business phone carrier | – |
| 415-900 | Onvoy | Internet / business phone carrier | – |
| 415-910 | T-Mobile (including Sprint) | Mobile carrier | 2015 |
| 415-937 | Tpx Communications | Internet / business phone carrier | – |
| 415-960 | T-Mobile (including Sprint) | Mobile carrier | 2014 |
| 415-966 | T-Mobile (including Sprint) | Mobile carrier | 2014 |
| 628-202 | T-Mobile (including Sprint) | Mobile carrier | 2016 |
| 628-226 | AT&T Mobility | Mobile carrier | 2015 |
| 628-244 | Peerless Network Of California | Internet / business phone carrier | 2016 |
| 628-262 | Exiant Communications | Phone company | 2018 |
| 628-292 | Commio | Internet / business phone carrier | 2023 |
| 628-310 | T-Mobile (including Sprint) | Mobile carrier | 2024 |
| 628-315 | T-Mobile (including Sprint) | Mobile carrier | 2024 |
| 628-348 | Fractel | Internet / business phone carrier | 2020 |
| 628-724 | Fractel | Internet / business phone carrier | 2020 |
| 628-866 | Fractel | Internet / business phone carrier | 2021 |
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.