Phone numbers in Econtrcost, California
Econtrcost has 22 phone prefixes in area code 925.
Biggest holders: AT&T (local phone), Level 3 (Lumen), AT&T Mobility. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 9%
- Local phone company 32%
- Internet / business phone carrier 55%
- Phone company 5%
Every prefix in Econtrcost
Search the first six digits of a number in this list. If it's here, the number started in Econtrcost with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 925-240 | AT&T (local phone) | Local phone company | – |
| 925-306 | Sonic Telecom | Phone company | 2017 |
| 925-308 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 925-390 | AT&T Mobility | Mobile carrier | 2016 |
| 925-392 | Teleport Communications America | Internet / business phone carrier | – |
| 925-418 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 925-420 | Onvoy | Internet / business phone carrier | – |
| 925-450 | Bandwidth | Internet / business phone carrier | 2020 |
| 925-508 | Onvoy | Internet / business phone carrier | 2023 |
| 925-513 | AT&T (local phone) | Local phone company | – |
| 925-516 | AT&T (local phone) | Local phone company | – |
| 925-559 | AT&T Mobility | Mobile carrier | 2026 |
| 925-578 | TON80 Communications | Internet / business phone carrier | 2020 |
| 925-625 | AT&T (local phone) | Local phone company | – |
| 925-626 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 925-634 | AT&T (local phone) | Local phone company | – |
| 925-666 | Matrix Telecom, Llc. S/i/i Tnci | Internet / business phone carrier | – |
| 925-679 | AT&T (local phone) | Local phone company | – |
| 925-684 | AT&T (local phone) | Local phone company | – |
| 925-809 | Tpx Communications | Internet / business phone carrier | 2001 |
| 925-832 | TON80 Communications | Internet / business phone carrier | 2022 |
| 925-880 | 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.