T-MOBILE USA, INC.
74 prefixes in 657 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 657-206 | GARDEN GRV | 6529 | 2010-05-18 | Yes |
| 657-238 | CYPRESS | 6529 | 2014-04-28 | Yes |
| 657-246 | BREA | 6529 | 2014-09-03 | Yes |
| 657-252 | BUENA PARK | 6529 | 2014-09-23 | Yes |
| 657-253 | FULLERTON | 6529 | 2014-10-17 | Yes |
| 657-254 | ANAHEIM | 6529 | 2014-10-16 | Yes |
| 657-257 | WESTMINSTR | 6529 | 2015-09-11 | Yes |
| 657-266 | SANTA ANA | 6529 | 2015-05-11 | Yes |
| 657-271 | WESTMINSTR | 6529 | 2015-05-05 | Yes |
| 657-272 | ANAHEIM | 6529 | 2015-05-20 | Yes |
| 657-275 | PLACENTIA | 6529 | 2015-07-01 | Yes |
| 657-281 | ORANGE | 6529 | 2015-08-05 | Yes |
| 657-296 | GARDEN GRV | 6529 | 2015-11-23 | Yes |
| 657-319 | FULLERTON | 6529 | 2018-03-29 | Yes |
| 657-321 | SANTA ANA | 6529 | 2016-03-04 | Yes |
| 657-334 | WESTMINSTR | 6529 | 2016-06-10 | Yes |
| 657-335 | SANTA ANA | 6529 | 2016-06-17 | Yes |
| 657-340 | WESTMINSTR | 6529 | 2016-08-30 | Yes |
| 657-341 | BREA | 6529 | 2016-06-29 | Yes |
| 657-342 | HUNTITNBCH | 6529 | 2016-08-09 | Yes |
| 657-345 | YORBALINDA | 6529 | 2016-08-26 | Yes |
| 657-346 | SANTA ANA | 6529 | 2016-09-21 | Yes |
| 657-347 | ANAHEIM | 6529 | — | Yes |
| 657-351 | SILVERADO | 6529 | 2016-11-02 | Yes |
| 657-355 | HUNTITNBCH | 6529 | 2017-12-14 | Yes |
| 657-357 | SANTA ANA | 6529 | — | Yes |
| 657-363 | YORBALINDA | 6529 | 2014-10-17 | Yes |
| 657-365 | HUNTITNBCH | 6529 | 2018-09-18 | Yes |
| 657-372 | HUNTITNBCH | 6529 | 2019-02-27 | Yes |
| 657-375 | SANTA ANA | 6529 | 2019-03-20 | Yes |
| 657-431 | WESTMINSTR | 6529 | 2019-03-20 | Yes |
| 657-445 | FULLERTON | 6529 | 2015-10-19 | Yes |
| 657-456 | ANAHEIM | 6529 | — | Yes |
| 657-502 | HUNTITNBCH | 6529 | 2021-06-09 | Yes |
| 657-505 | ANAHEIM | 6529 | 2021-05-19 | Yes |
| 657-508 | CYPRESS | 6529 | 2021-06-30 | Yes |
| 657-523 | GARDEN GRV | 6529 | 2021-09-27 | Yes |
| 657-527 | ANAHEIM | 6529 | 2021-08-23 | Yes |
| 657-534 | ORANGE | 6529 | 2021-11-17 | Yes |
| 657-537 | SILVERADO | 6529 | 2021-12-10 | Yes |
| 657-540 | HUNTITNBCH | 6529 | 2022-01-10 | Yes |
| 657-543 | SANTA ANA | 6529 | 2022-01-10 | Yes |
| 657-551 | WESTMINSTR | 6529 | 2021-11-09 | Yes |
| 657-556 | CYPRESS | 6529 | 2021-11-18 | Yes |
| 657-585 | SANTA ANA | 6529 | 2022-04-25 | Yes |
| 657-608 | ORANGE | 6529 | 2022-07-14 | Yes |
| 657-612 | GARDEN GRV | 6529 | 2022-07-22 | Yes |
| 657-615 | ANAHEIM | 6529 | 2022-08-12 | Yes |
| 657-618 | SANTA ANA | 6529 | 2022-09-20 | Yes |
| 657-623 | ANAHEIM | 6529 | 2022-10-11 | Yes |
| 657-625 | CYPRESS | 6529 | 2022-09-20 | Yes |
| 657-676 | SANTA ANA | 6529 | 2023-08-10 | Yes |
| 657-678 | ANAHEIM | 6529 | 2023-08-10 | Yes |
| 657-679 | GARDEN GRV | 6529 | 2023-08-10 | Yes |
| 657-681 | FULLERTON | 6529 | 2023-08-23 | Yes |
| 657-684 | ORANGE | 6529 | 2023-08-23 | Yes |
| 657-695 | HUNTITNBCH | 6529 | 2023-09-26 | Yes |
| 657-698 | WESTMINSTR | 6529 | 2023-09-29 | Yes |
| 657-705 | CYPRESS | 6529 | 2023-10-10 | Yes |
| 657-709 | SANTA ANA | 6529 | 2023-12-04 | Yes |
| 657-710 | GARDEN GRV | 6529 | 2023-12-05 | Yes |
| 657-714 | BUENA PARK | 6529 | 2024-05-31 | Yes |
| 657-731 | ANAHEIM | 6529 | 2024-03-27 | Yes |
| 657-739 | ANAHEIM | 6529 | 2021-11-15 | Yes |
| 657-751 | FULLERTON | 6529 | 2024-05-22 | Yes |
| 657-752 | ORANGE | 6529 | 2024-05-31 | Yes |
| 657-754 | GARDEN GRV | 6529 | 2024-07-30 | Yes |
| 657-760 | HUNTITNBCH | 6529 | 2024-08-06 | Yes |
| 657-768 | ANAHEIM | 6529 | 2024-09-12 | Yes |
| 657-773 | HUNTITNBCH | 6529 | 2024-10-21 | Yes |
| 657-774 | ORANGE | 6529 | 2024-11-07 | Yes |
| 657-776 | ANAHEIM | 6529 | 2024-12-06 | Yes |
| 657-825 | ANAHEIM | 6529 | 2024-06-21 | Yes |
| 657-835 | ANAHEIM | 6529 | 2025-11-13 | 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.