Phone numbers in San Martin, California
San Martin has 22 phone prefixes in area codes 408, 669.
Biggest holders: Bandwidth, AT&T (local phone), T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 18%
- Local phone company 23%
- Internet / business phone carrier 59%
Every prefix in San Martin
Search the first six digits of a number in this list. If it's here, the number started in San Martin with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 408-214 | Bandwidth | Internet / business phone carrier | 2011 |
| 408-312 | Boost / Virgin Mobile | Mobile carrier | 2023 |
| 408-422 | T-Mobile (including Sprint) | Mobile carrier | – |
| 408-461 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 408-634 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 408-657 | Bandwidth | Internet / business phone carrier | – |
| 408-676 | Onvoy | Internet / business phone carrier | – |
| 408-681 | AT&T (local phone) | Local phone company | – |
| 408-682 | AT&T (local phone) | Local phone company | – |
| 408-683 | AT&T (local phone) | Local phone company | – |
| 408-686 | AT&T (local phone) | Local phone company | – |
| 408-692 | Onvoy | Internet / business phone carrier | – |
| 408-695 | AT&T (local phone) | Local phone company | – |
| 408-837 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 408-909 | Peerless Network Of California | Internet / business phone carrier | 2013 |
| 669-209 | Bandwidth | Internet / business phone carrier | 2016 |
| 669-228 | Bandwidth | Internet / business phone carrier | 2014 |
| 669-257 | Bandwidth | Internet / business phone carrier | 2014 |
| 669-280 | Bandwidth | Internet / business phone carrier | 2019 |
| 669-339 | T-Mobile (including Sprint) | Mobile carrier | 2024 |
| 669-399 | Fractel | Internet / business phone carrier | 2020 |
| 669-587 | 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.