Every public data breach

Disclosed this week44On record26,355

44 disclosed this week · 26,355 on record

T-Mobile USA

Disclosed Aug 24, 2021Confirmed

Official notice

What is known

People affectedNot stated in the sources we have
DisclosedAug 24, 2021
DiscoveredAug 17, 2021
HappenedJul 22, 2021
AttackHacking
Data exposedNot stated
SectorTelecom · US
StatusConfirmed

Sources

Official noticeoag.ca.gov
California Attorney General breach notice: T-Mobile USA
Official noticeatg.wa.gov
Washington Attorney General breach notice: T-Mobile USA
Official noticejustice.oregon.gov
Oregon DOJ breach notice: T-Mobile USA

Notices filed

Residents of WAAug 24, 2021
Washington AG2,079,648 people
Residents of CAAug 25, 2021
California AGCount not stated
Residents of ORAug 27, 2021
Oregon DOJCount not stated

Other breaches at T-Mobile USA

Hacking breachHacking, data exposed not stated. Reported to the Washington AG.TelecomUSJan 19, 2023Breach, details not statedBreach notice filed with the Indiana AG, details not stated.1,027 affectedTelecomUSMar 10, 2020Breach, details not statedExposed names, Social Security numbers, government IDs and payment cards. Reported to the California AG.TelecomUSOct 1, 2015
History of this record
attack2026-09-25
unknown to hackingby backfillSource
disclosed2026-09-25
2021-08-25 to 2021-08-24by backfillSource
discovered2026-09-25
empty to 2021-08-17by backfillSource
Added2026-09-25
First recordedby backfillSource

First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.

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