T-MOBILE USA, INC.
13 prefixes in 831 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 831-207 | HOLLISTER | 6529 | 2001-09-12 | Yes |
| 831-210 | SALINAS | 6529 | 2002-01-16 | Yes |
| 831-224 | MONTEREY | 6529 | — | Yes |
| 831-240 | SALINAS | 6529 | — | Yes |
| 831-266 | SANTA CRUZ | 6529 | 2021-03-24 | Yes |
| 831-295 | SANTA CRUZ | 6529 | 2001-12-14 | Yes |
| 831-297 | HOLLISTER | 6529 | 2001-12-14 | Yes |
| 831-346 | SANTA CRUZ | 6529 | 2014-09-23 | Yes |
| 831-406 | WATSONVL | 6529 | 2001-12-14 | Yes |
| 831-512 | SALINAS | 6529 | — | Yes |
| 831-539 | WATSONVL | 6529 | — | Yes |
| 831-750 | WATSONVL | 6529 | — | Yes |
| 831-970 | SALINAS | 6529 | — | Yes |
These are initial assignees from NANPA CO-code records — because of number portability, the current serving carrier of individual numbers may differ. Bulk export requires a membership.