Phone numbers in San Ysidro, New Mexico
San Ysidro has 3 phone prefixes in area code 575.
Biggest holders: Onvoy, TON80 Communications, Windstream Comm Sw. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 33%
- Internet / business phone carrier 67%
Every prefix in San Ysidro
Search the first six digits of a number in this list. If it's here, the number started in San Ysidro with the carrier shown. If it isn't, check the New Mexico page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 575-255 | Onvoy | Internet / business phone carrier | 2017 |
| 575-663 | TON80 Communications | Internet / business phone carrier | 2022 |
| 575-834 | Windstream Comm Sw | 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.