Phone numbers in Lockhart, Texas
Lockhart has 17 phone prefixes in area codes 512, 737.
Biggest holders: AT&T (local phone), Onvoy, AT&T Mobility. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 18%
- Local phone company 29%
- Internet / business phone carrier 53%
Every prefix in Lockhart
Search the first six digits of a number in this list. If it's here, the number started in Lockhart with the carrier shown. If it isn't, check the Texas page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 512-213 | Level 3 (Lumen) | Internet / business phone carrier | 2003 |
| 512-227 | AT&T (local phone) | Local phone company | 2001 |
| 512-359 | Teleport Communications America | Internet / business phone carrier | 2010 |
| 512-376 | AT&T (local phone) | Local phone company | – |
| 512-398 | AT&T (local phone) | Local phone company | – |
| 512-620 | AT&T (local phone) | Local phone company | – |
| 512-668 | Charter / Spectrum | Internet / business phone carrier | 2005 |
| 512-729 | Onvoy | Internet / business phone carrier | – |
| 512-855 | AT&T (local phone) | Local phone company | 2002 |
| 512-885 | Onvoy | Internet / business phone carrier | 2022 |
| 512-995 | AT&T Mobility | Mobile carrier | – |
| 737-264 | MetroPCS (T-Mobile) | Mobile carrier | 2019 |
| 737-355 | Bandwidth | Internet / business phone carrier | 2023 |
| 737-357 | Onvoy | Internet / business phone carrier | 2021 |
| 737-450 | Onvoy | Internet / business phone carrier | 2025 |
| 737-477 | Fractel | Internet / business phone carrier | 2020 |
| 737-983 | AT&T Mobility | Mobile carrier | 2024 |
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.