T-MOBILE USA, INC.
39 prefixes in 303 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 303-210 | DENVER | 6529 | — | Yes |
| 303-246 | DENVER | 6529 | — | Yes |
| 303-257 | DENVER | 6529 | — | Yes |
| 303-332 | DENVER | 6529 | — | — |
| 303-356 | DENVER | 6529 | — | Yes |
| 303-359 | DENVER | 6529 | — | — |
| 303-419 | DENVER | 6529 | — | Yes |
| 303-434 | DENVER | 6529 | — | Yes |
| 303-435 | DENVER | 6529 | — | Yes |
| 303-437 | DENVER | 6529 | — | Yes |
| 303-472 | DENVER | 6529 | — | Yes |
| 303-505 | DENVER | 6529 | 2012-11-09 | Yes |
| 303-507 | DENVER | 6529 | — | Yes |
| 303-520 | DENVER | 6529 | — | Yes |
| 303-521 | DENVER | 6529 | — | Yes |
| 303-522 | DENVER | 6529 | — | Yes |
| 303-523 | DENVER | 6529 | — | — |
| 303-525 | DENVER | 6529 | — | Yes |
| 303-564 | DENVER | 6529 | — | — |
| 303-587 | DENVER | 6529 | — | Yes |
| 303-591 | DENVER | 6529 | — | Yes |
| 303-596 | DENVER | 6529 | — | Yes |
| 303-598 | DENVER | 6529 | — | Yes |
| 303-641 | DENVER | 6529 | — | Yes |
| 303-667 | DENVER | 6529 | — | — |
| 303-668 | DENVER | 6529 | — | — |
| 303-669 | DENVER | 6529 | — | — |
| 303-725 | DENVER | 6529 | — | Yes |
| 303-875 | DENVER | 6529 | — | — |
| 303-901 | DENVER | 6529 | — | Yes |
| 303-931 | DENVER | 6529 | — | — |
| 303-944 | DENVER | 6529 | — | Yes |
| 303-946 | DENVER | 6529 | — | Yes |
| 303-949 | DENVER | 6529 | — | Yes |
| 303-960 | DENVER | 6529 | — | — |
| 303-961 | DENVER | 6529 | — | Yes |
| 303-990 | FORTLUPTON | 6529 | 2006-05-16 | Yes |
| 303-994 | DENVER | 6529 | — | Yes |
| 303-995 | DENVER | 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.