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Latest / California / August 2021

T-Mobile USA

T-Mobile USA notified California AG on Aug 25, 2021 of a data breach, which occurred on Jul 22, 2021. Data exposed: Social Security number, Financial / bank account, Usernames / passwords, Phone number, Postal address.

All 3 filings by T-Mobile USA, state by state · Case file (dates, days to notice against the statute, what the letter offers, prior incidents)

Organization
T-Mobile USA
Source
California AG · source record
Date reported
Aug 25, 2021
Date(s) of breach
Thursday, July 22, 2021
Residents affected
Not published by this source
Data exposed
Social Security number Financial / bank account Usernames / passwords Phone number Postal address
Notice letter
Sample notice (PDF)
Discovered
Aug 17, 2021, as stated in the letter
"What happened:  Log in  (https://www.t-mobile.com) 8/19/2021 Our Response to the Data Breach (Aug 2021) | T-Mobile https://www.t-mobile.com/brand/data-breach-2021?icid=MGPO_TMO_P_21DTASECRT_8SZBD38SJT3BHWAY26101 2/5 On August 17, 2021,..."
Days to notice
8 days from discovery (Aug 17, 2021) to the California record (Aug 25, 2021). Statute: 30 days from discovery or notification of the breach (Cal. Civ. Code § 1798.82).
First seen by BreachTally
2026-10-30 16:05 UTC

Dates and counts as filed by the organization with the agency. The breach window and the report date often differ by months.

First seen by BreachTally at 16:05 UTC on Oct 30, 2026. New filings reach paid subscribers within 30 minutes of the agency posting, with the count, the data exposed and the letter. Start a 14-day free trial. We email you two days before the first charge and you cancel in one click.
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Other filings by T-Mobile USA

OrganizationSourceStateReportedResidents affectedData exposed
T-Mobile USA Oregon DOJ OR Aug 27, 2021 Not published Not stated
T-Mobile USA, Inc. California AG CA Oct 1, 2015 Not published Social Security numberPassport numberFinancial / bank accountDate of birth+3

Data reproduced from a public government filing. Spot an error? Email support@breachtally.com with the record link. Corrections are applied and noted.