T-MOBILE USA, INC.
6 prefixes in 340 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 340-203 | CHTAMSTTHS | 6529 | 2020-12-22 | — |
| 340-208 | ST CROIX | 6529 | 2021-02-01 | — |
| 340-277 | ST CROIX | 6529 | 2001-08-14 | — |
| 340-332 | ST CROIX | 6529 | 2003-12-16 | — |
| 340-344 | CHTAMSTTHS | 6529 | 2003-10-13 | — |
| 340-998 | CHTAMSTTHS | 6529 | 2001-08-14 | — |
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.