Phone numbers in Half Moon Bay, California
Half Moon Bay has 21 phone prefixes in area code 650.
Biggest holders: T-Mobile (including Sprint), AT&T (local phone), MCImetro (Verizon Business). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 33%
- Local phone company 14%
- Internet / business phone carrier 52%
Every prefix in Half Moon Bay
Search the first six digits of a number in this list. If it's here, the number started in Half Moon Bay with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 650-276 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 650-284 | T-Mobile (including Sprint) | Mobile carrier | – |
| 650-309 | T-Mobile (including Sprint) | Mobile carrier | 2017 |
| 650-338 | T-Mobile (including Sprint) | Mobile carrier | 2014 |
| 650-402 | T-Mobile (including Sprint) | Mobile carrier | 2018 |
| 650-440 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 650-459 | Bandwidth | Internet / business phone carrier | 2019 |
| 650-476 | T-Mobile (including Sprint) | Mobile carrier | 2016 |
| 650-479 | Tpx Communications | Internet / business phone carrier | – |
| 650-560 | AT&T (local phone) | Local phone company | – |
| 650-660 | T-Mobile (including Sprint) | Mobile carrier | 2015 |
| 650-712 | AT&T (local phone) | Local phone company | – |
| 650-713 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 650-720 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 650-726 | AT&T (local phone) | Local phone company | – |
| 650-729 | Teleport Communications America | Internet / business phone carrier | – |
| 650-750 | Onvoy | Internet / business phone carrier | 2016 |
| 650-791 | Onvoy | Internet / business phone carrier | 2026 |
| 650-889 | IP Horizon | Internet / business phone carrier | – |
| 650-912 | Commio | Internet / business phone carrier | 2022 |
| 650-955 | 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.