Phone numbers in Fullerton, California
Fullerton has 63 phone prefixes in area codes 657, 714.
Biggest holders: AT&T (local phone), T-Mobile (including Sprint), Verizon Wireless. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 29%
- Local phone company 32%
- Internet / business phone carrier 38%
- Paging service 2%
Every prefix in Fullerton
Search the first six digits of a number in this list. If it's here, the number started in Fullerton with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 657-217 | Bandwidth | Internet / business phone carrier | 2011 |
| 657-225 | Peerless Network Of California | Internet / business phone carrier | 2012 |
| 657-243 | Level 3 (Lumen) | Internet / business phone carrier | 2014 |
| 657-248 | AT&T Mobility | Mobile carrier | 2014 |
| 657-253 | T-Mobile (including Sprint) | Mobile carrier | 2014 |
| 657-278 | AT&T (local phone) | Local phone company | 2008 |
| 657-319 | T-Mobile (including Sprint) | Mobile carrier | 2018 |
| 657-330 | Peerless Network Of California | Internet / business phone carrier | 2012 |
| 657-354 | MetroPCS (T-Mobile) | Mobile carrier | 2017 |
| 657-378 | Peerless Network Of California | Internet / business phone carrier | 2012 |
| 657-445 | T-Mobile (including Sprint) | Mobile carrier | 2015 |
| 657-500 | Onvoy | Internet / business phone carrier | – |
| 657-525 | Commio | Internet / business phone carrier | 2021 |
| 657-554 | Verizon Wireless | Mobile carrier | 2022 |
| 657-566 | Fractel | Internet / business phone carrier | 2021 |
| 657-577 | Fractel | Internet / business phone carrier | 2020 |
| 657-631 | Bandwidth | Internet / business phone carrier | 2022 |
| 657-632 | Bandwidth | Internet / business phone carrier | 2022 |
| 657-681 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 657-706 | Verizon Wireless | Mobile carrier | 2023 |
| 657-749 | Verizon Wireless | Mobile carrier | 2024 |
| 657-751 | T-Mobile (including Sprint) | Mobile carrier | 2024 |
| 657-767 | TON80 Communications | Internet / business phone carrier | 2022 |
| 657-793 | Verizon Wireless | Mobile carrier | 2025 |
| 657-799 | Fractel | Internet / business phone carrier | 2020 |
| 657-868 | Verizon Wireless | Mobile carrier | 2026 |
| 714-213 | AT&T (local phone) | Local phone company | – |
| 714-253 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 714-275 | American Messaging Services | Paging service | – |
| 714-278 | AT&T (local phone) | Local phone company | – |
| 714-388 | Tpx Communications | Internet / business phone carrier | – |
| 714-441 | AT&T (local phone) | Local phone company | – |
| 714-446 | AT&T (local phone) | Local phone company | – |
| 714-447 | AT&T (local phone) | Local phone company | – |
| 714-449 | AT&T (local phone) | Local phone company | – |
| 714-451 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 714-459 | Teleport Communications America | Internet / business phone carrier | – |
| 714-461 | MetroPCS (T-Mobile) | Mobile carrier | 2012 |
| 714-476 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 714-515 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 714-519 | AT&T (local phone) | Local phone company | – |
| 714-525 | AT&T (local phone) | Local phone company | – |
| 714-526 | AT&T (local phone) | Local phone company | – |
| 714-578 | AT&T (local phone) | Local phone company | – |
| 714-626 | AT&T (local phone) | Local phone company | – |
| 714-680 | AT&T (local phone) | Local phone company | – |
| 714-681 | Teleport Communications America | Internet / business phone carrier | – |
| 714-686 | AT&T Mobility | Mobile carrier | 2001 |
| 714-726 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 714-732 | AT&T (local phone) | Local phone company | – |
| 714-738 | AT&T (local phone) | Local phone company | – |
| 714-770 | MetroPCS (T-Mobile) | Mobile carrier | 2009 |
| 714-773 | AT&T (local phone) | Local phone company | – |
| 714-853 | T-Mobile (including Sprint) | Mobile carrier | 2012 |
| 714-869 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 714-870 | AT&T (local phone) | Local phone company | – |
| 714-871 | AT&T (local phone) | Local phone company | – |
| 714-872 | MCImetro (Verizon Business) | Internet / business phone carrier | 2001 |
| 714-879 | AT&T (local phone) | Local phone company | – |
| 714-882 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 714-888 | Tpx Communications | Internet / business phone carrier | – |
| 714-930 | IP Horizon | Internet / business phone carrier | – |
| 714-992 | AT&T (local phone) | Local phone company | – |
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.