Phone numbers in Mercedes, Texas
Mercedes has 10 phone prefixes in area code 956.
Biggest holders: Onvoy, AT&T (local phone), Smartcom Telephone. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 10%
- Local phone company 30%
- Internet / business phone carrier 50%
- Phone company 10%
Every prefix in Mercedes
Search the first six digits of a number in this list. If it's here, the number started in Mercedes with the carrier shown. If it isn't, check the Texas page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 956-260 | Smartcom Telephone | Phone company | 2003 |
| 956-294 | Teleport Communications America | Internet / business phone carrier | 2010 |
| 956-474 | Onvoy | Internet / business phone carrier | 2019 |
| 956-514 | AT&T (local phone) | Local phone company | – |
| 956-565 | AT&T (local phone) | Local phone company | – |
| 956-634 | Onvoy | Internet / business phone carrier | 2021 |
| 956-741 | Onvoy | Internet / business phone carrier | 2023 |
| 956-825 | AT&T (local phone) | Local phone company | – |
| 956-876 | Stpcs Joint Venture | Mobile carrier | 2026 |
| 956-903 | Charter / Spectrum | Internet / business phone carrier | 2004 |
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.