DisclosureLens
UnknownGovernment IDCritical

T-MOBILE USA, INC.

bd_f401f39a02cdaac6 · schema v1 · pii pii-v1

Severity

Critical

Discovered

Aug 17, 2021

Filed

Aug 19, 2021

To disclose

2 days

Affected

53,800,000

Linked

7 filings

Confidence

95%
Full breach record for T-MOBILE USA, INC. →22 incidents on file

T-Mobile reported a data breach to the Delaware Attorney General. The breach occurred on 2021-08-12. It was discovered on 2021-08-17. Notice was filed on 2021-08-19. 53,800,000 individuals affected in total. Information involved: identity government.

Delaware clock✓ DE credit monitoring due2 days discovery → filing
⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 5 days
discovery → filing · 2 days

Aug 12, 2021

Begins

Aug 17, 2021

Discovered

Aug 19, 2021

Filed

This filing is one of 7 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (6) · sorted by filing gap

Show 2 more filings ↓up to 12d gap

Filing propagation · 7 filings · 7 states

View merged incident ↗
New Hampshire State AGAug 19 · first
Delaware State AGAug 19 · first · this page
Washington State AG+5d
California State AG+6d
Massachusetts State AG+7d
Oregon State AG+8d
South Carolina State AG+12d

Pattern: first filing Aug 19 (NH), last Aug 31 (SC) — a 12-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.