Phone numbers in Calexico, California
Calexico has 11 phone prefixes in area codes 442, 760.
Biggest holders: Onvoy, AT&T Mobility, AT&T (local phone). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 18%
- Local phone company 18%
- Internet / business phone carrier 64%
Every prefix in Calexico
Search the first six digits of a number in this list. If it's here, the number started in Calexico with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 442-200 | Onvoy | Internet / business phone carrier | – |
| 442-250 | Peerless Network Of California | Internet / business phone carrier | 2017 |
| 442-252 | Bandwidth | Internet / business phone carrier | – |
| 442-367 | AT&T Mobility | Mobile carrier | 2021 |
| 442-409 | AT&T Mobility | Mobile carrier | 2023 |
| 442-432 | Fractel | Internet / business phone carrier | 2020 |
| 442-460 | Onvoy | Internet / business phone carrier | 2024 |
| 760-357 | AT&T (local phone) | Local phone company | – |
| 760-618 | Teleport Communications America | Internet / business phone carrier | 2007 |
| 760-768 | AT&T (local phone) | Local phone company | – |
| 760-890 | Level 3 (Lumen) | Internet / business phone carrier | 2005 |
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.