Phone numbers in Pacifica, California
Pacifica has 18 phone prefixes in area code 650.
Biggest holders: AT&T (local phone), T-Mobile (including Sprint), Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 33%
- Local phone company 22%
- Internet / business phone carrier 44%
Every prefix in Pacifica
Search the first six digits of a number in this list. If it's here, the number started in Pacifica with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 650-290 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 650-355 | AT&T (local phone) | Local phone company | – |
| 650-359 | AT&T (local phone) | Local phone company | – |
| 650-420 | T-Mobile (including Sprint) | Mobile carrier | 2018 |
| 650-451 | T-Mobile (including Sprint) | Mobile carrier | – |
| 650-501 | Bandwidth | Internet / business phone carrier | 2019 |
| 650-516 | Tpx Communications | Internet / business phone carrier | – |
| 650-557 | AT&T (local phone) | Local phone company | – |
| 650-661 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 650-663 | AT&T Mobility | Mobile carrier | 2021 |
| 650-675 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 650-733 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 650-735 | Teleport Communications America | Internet / business phone carrier | – |
| 650-738 | AT&T (local phone) | Local phone company | – |
| 650-898 | Comcast | Internet / business phone carrier | – |
| 650-939 | Onvoy | Internet / business phone carrier | 2026 |
| 650-977 | Fractel | Internet / business phone carrier | 2019 |
| 650-984 | Onvoy | Internet / business phone carrier | – |
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.