Phone numbers in De Kalb, Texas
De Kalb has 4 phone prefixes in area codes 430, 903.
Biggest holders: Windstream Comm Sw, Level 3 (Lumen), T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 25%
- Local phone company 50%
- Internet / business phone carrier 25%
Every prefix in De Kalb
Search the first six digits of a number in this list. If it's here, the number started in De Kalb with the carrier shown. If it isn't, check the Texas page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 430-208 | Level 3 (Lumen) | Internet / business phone carrier | 2014 |
| 430-227 | Windstream Comm Sw | Local phone company | 2015 |
| 903-667 | Windstream Comm Sw | Local phone company | – |
| 903-933 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
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.