T-MOBILE USA, INC.
44 prefixes in 858 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 858-205 | DEL MAR | 6529 | 2002-01-16 | Yes |
| 858-209 | DEL MAR | 6529 | 2017-05-22 | Yes |
| 858-212 | POWAY | 6529 | — | Yes |
| 858-213 | POWAY | 6529 | — | Yes |
| 858-214 | LA JOLLA | 6529 | 2017-11-22 | Yes |
| 858-220 | LA JOLLA | 6529 | 2002-01-18 | Yes |
| 858-231 | POWAY | 6529 | 2001-12-14 | — |
| 858-241 | LA JOLLA | 6529 | 2021-01-08 | Yes |
| 858-252 | DEL MAR | 6529 | 2014-10-08 | Yes |
| 858-254 | POWAY | 6529 | — | Yes |
| 858-260 | LA JOLLA | 6529 | 2013-07-22 | Yes |
| 858-261 | DEL MAR | 6529 | 2015-02-18 | Yes |
| 858-262 | SNDG LVTA | 6529 | 2015-03-11 | Yes |
| 858-267 | SNDG MRMS | 6529 | 2015-09-25 | Yes |
| 858-290 | DEL MAR | 6529 | 2019-02-28 | Yes |
| 858-305 | SNDG MRMS | 6529 | 2021-02-17 | Yes |
| 858-308 | SNDG LVTA | 6529 | 2021-03-10 | Yes |
| 858-313 | DEL MAR | 6529 | 2021-03-11 | Yes |
| 858-319 | LA JOLLA | 6529 | 2021-03-24 | Yes |
| 858-330 | RNCHOPNQTS | 6529 | 2021-11-18 | Yes |
| 858-341 | CHULAVISTA | 6529 | 2022-10-28 | Yes |
| 858-389 | CHULAVISTA | 6529 | 2023-10-10 | Yes |
| 858-405 | LA JOLLA | 6529 | 2001-12-14 | — |
| 858-407 | CHULAVISTA | 6529 | 2024-08-30 | Yes |
| 858-415 | SNDG SNDG | 6529 | 2024-09-19 | Yes |
| 858-443 | CHULAVISTA | 6529 | 2025-10-21 | Yes |
| 858-445 | SNDG MRMS | 6529 | 2025-11-28 | Yes |
| 858-504 | RNCHOSANFE | 6529 | 2002-08-30 | Yes |
| 858-518 | LA JOLLA | 6529 | — | Yes |
| 858-583 | SNDG LVTA | 6529 | 2001-09-24 | Yes |
| 858-602 | POWAY | 6529 | 2002-04-01 | Yes |
| 858-610 | SNDG MRMS | 6529 | 2002-08-30 | Yes |
| 858-652 | LA JOLLA | 6529 | 2006-09-21 | Yes |
| 858-663 | POWAY | 6529 | — | Yes |
| 858-682 | POWAY | 6529 | — | Yes |
| 858-717 | SNDG LVTA | 6529 | 2002-08-30 | Yes |
| 858-733 | RNCHOPNQTS | 6529 | 2002-08-30 | Yes |
| 858-752 | LA JOLLA | 6529 | — | Yes |
| 858-776 | RNCHOBRNDO | 6529 | 2002-08-30 | Yes |
| 858-829 | POWAY | 6529 | — | Yes |
| 858-864 | LA JOLLA | 6529 | — | Yes |
| 858-883 | POWAY | 6529 | — | Yes |
| 858-902 | CHULAVISTA | 6529 | 2024-05-31 | Yes |
| 858-967 | LA JOLLA | 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.