Phone numbers in Sunnyvale, California
Sunnyvale has 123 phone prefixes in area codes 408, 669.
Biggest holders: AT&T (local phone), T-Mobile (including Sprint), MCImetro (Verizon Business). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 26%
- Local phone company 37%
- Internet / business phone carrier 36%
- Phone company 2%
Every prefix in Sunnyvale
Search the first six digits of a number in this list. If it's here, the number started in Sunnyvale with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 408-203 | AT&T Mobility | Mobile carrier | – |
| 408-212 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 408-215 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 408-220 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 408-222 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 408-230 | T-Mobile (including Sprint) | Mobile carrier | – |
| 408-242 | AT&T Mobility | Mobile carrier | – |
| 408-245 | AT&T (local phone) | Local phone company | – |
| 408-290 | Bandwidth | Internet / business phone carrier | 2011 |
| 408-306 | AT&T Mobility | Mobile carrier | 2001 |
| 408-328 | AT&T (local phone) | Local phone company | – |
| 408-329 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 408-331 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 408-336 | AT&T (local phone) | Local phone company | 2006 |
| 408-338 | AT&T (local phone) | Local phone company | 2006 |
| 408-349 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 408-368 | AT&T Mobility | Mobile carrier | 2002 |
| 408-373 | T-Mobile (including Sprint) | Mobile carrier | – |
| 408-393 | T-Mobile (including Sprint) | Mobile carrier | – |
| 408-394 | T-Mobile (including Sprint) | Mobile carrier | – |
| 408-400 | AT&T (local phone) | Local phone company | – |
| 408-419 | AT&T (local phone) | Local phone company | 2006 |
| 408-420 | T-Mobile (including Sprint) | Mobile carrier | – |
| 408-431 | AT&T Mobility | Mobile carrier | – |
| 408-462 | Level 3 (Lumen) | Internet / business phone carrier | 2009 |
| 408-469 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 408-470 | Teleport Communications America | Internet / business phone carrier | – |
| 408-475 | Bandwidth | Internet / business phone carrier | 2011 |
| 408-480 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 408-481 | AT&T (local phone) | Local phone company | – |
| 408-498 | Comcast | Internet / business phone carrier | 2011 |
| 408-505 | AT&T Mobility | Mobile carrier | – |
| 408-507 | AT&T Mobility | Mobile carrier | – |
| 408-522 | AT&T (local phone) | Local phone company | – |
| 408-523 | AT&T (local phone) | Local phone company | – |
| 408-524 | AT&T (local phone) | Local phone company | – |
| 408-530 | AT&T (local phone) | Local phone company | – |
| 408-541 | AT&T (local phone) | Local phone company | – |
| 408-542 | AT&T (local phone) | Local phone company | – |
| 408-543 | AT&T (local phone) | Local phone company | – |
| 408-548 | AT&T (local phone) | Local phone company | – |
| 408-584 | AT&T (local phone) | Local phone company | – |
| 408-585 | Tpx Communications | Internet / business phone carrier | – |
| 408-593 | T-Mobile (including Sprint) | Mobile carrier | – |
| 408-594 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 408-598 | Verizon Wireless | Mobile carrier | 2007 |
| 408-604 | MCImetro (Verizon Business) | Internet / business phone carrier | 2012 |
| 408-616 | AT&T (local phone) | Local phone company | – |
| 408-617 | AT&T (local phone) | Local phone company | – |
| 408-636 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 408-663 | Verizon Wireless | Mobile carrier | 2010 |
| 408-664 | Teleport Communications America | Internet / business phone carrier | 2012 |
| 408-675 | Level 3 (Lumen) | Internet / business phone carrier | 2010 |
| 408-685 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 408-701 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 408-702 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 408-716 | Onvoy | Internet / business phone carrier | – |
| 408-718 | AT&T Mobility | Mobile carrier | – |
| 408-720 | AT&T (local phone) | Local phone company | – |
| 408-721 | AT&T (local phone) | Local phone company | – |
| 408-730 | AT&T (local phone) | Local phone company | – |
| 408-731 | AT&T (local phone) | Local phone company | – |
| 408-732 | AT&T (local phone) | Local phone company | – |
| 408-733 | AT&T (local phone) | Local phone company | – |
| 408-734 | AT&T (local phone) | Local phone company | – |
| 408-735 | AT&T (local phone) | Local phone company | – |
| 408-736 | AT&T (local phone) | Local phone company | – |
| 408-737 | AT&T (local phone) | Local phone company | – |
| 408-738 | AT&T (local phone) | Local phone company | – |
| 408-739 | AT&T (local phone) | Local phone company | – |
| 408-742 | AT&T (local phone) | Local phone company | – |
| 408-743 | AT&T (local phone) | Local phone company | – |
| 408-744 | AT&T (local phone) | Local phone company | – |
| 408-745 | AT&T (local phone) | Local phone company | – |
| 408-746 | AT&T (local phone) | Local phone company | – |
| 408-747 | AT&T (local phone) | Local phone company | – |
| 408-749 | AT&T (local phone) | Local phone company | – |
| 408-752 | AT&T (local phone) | Local phone company | – |
| 408-756 | AT&T (local phone) | Local phone company | – |
| 408-757 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 408-769 | Verizon Wireless | Mobile carrier | – |
| 408-773 | AT&T (local phone) | Local phone company | – |
| 408-774 | AT&T (local phone) | Local phone company | – |
| 408-789 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 408-822 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 408-830 | AT&T (local phone) | Local phone company | – |
| 408-835 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 408-836 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 408-900 | Onvoy | Internet / business phone carrier | – |
| 408-910 | MetroPCS (T-Mobile) | Mobile carrier | 2001 |
| 408-936 | AT&T (local phone) | Local phone company | – |
| 408-940 | Level 3 (Lumen) | Internet / business phone carrier | 2008 |
| 408-962 | Teleport Communications America | Internet / business phone carrier | – |
| 408-990 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 408-991 | AT&T (local phone) | Local phone company | – |
| 408-992 | AT&T (local phone) | Local phone company | – |
| 669-206 | Onvoy | Internet / business phone carrier | 2016 |
| 669-215 | T-Mobile (including Sprint) | Mobile carrier | 2016 |
| 669-224 | T-Mobile (including Sprint) | Mobile carrier | 2013 |
| 669-241 | T-Mobile (including Sprint) | Mobile carrier | 2014 |
| 669-246 | AT&T Enterprises | Phone company | 2014 |
| 669-248 | Verizon Wireless | Mobile carrier | 2014 |
| 669-249 | T-Mobile (including Sprint) | Mobile carrier | 2017 |
| 669-264 | Comcast | Internet / business phone carrier | 2015 |
| 669-277 | Level 3 (Lumen) | Internet / business phone carrier | 2018 |
| 669-290 | T-Mobile (including Sprint) | Mobile carrier | 2019 |
| 669-314 | Tpx Communications | Internet / business phone carrier | 2022 |
| 669-323 | Bandwidth | Internet / business phone carrier | 2022 |
| 669-348 | Fractel | Internet / business phone carrier | 2020 |
| 669-357 | Shelcomm | Phone company | 2024 |
| 669-378 | Onvoy | Internet / business phone carrier | 2026 |
| 669-454 | Verizon Wireless | Mobile carrier | 2017 |
| 669-455 | TON80 Communications | Internet / business phone carrier | 2022 |
| 669-467 | T-Mobile (including Sprint) | Mobile carrier | 2018 |
| 669-529 | Fractel | Internet / business phone carrier | 2019 |
| 669-577 | Fractel | Internet / business phone carrier | 2021 |
| 669-600 | Onvoy | Internet / business phone carrier | – |
| 669-649 | Onvoy | Internet / business phone carrier | 2020 |
| 669-679 | Onvoy | Internet / business phone carrier | 2022 |
| 669-721 | Level 3 (Lumen) | Internet / business phone carrier | 2013 |
| 669-732 | Fractel | Internet / business phone carrier | 2020 |
| 669-777 | Onvoy | Internet / business phone carrier | – |
| 669-788 | 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.