Every public data breach

Disclosed this week44On record26,355

44 disclosed this week · 26,355 on record

T-Mobile USA

Disclosed Oct 1, 2015Confirmed

Official notice

What is known

People affectedNot stated in the sources we have
DisclosedOct 1, 2015
HappenedSep 14, 2015
AttackNot stated
Data exposedNamesSocial Security numbersGovernment IDsPayment cards
SectorTelecom · US
StatusConfirmed

Sources

Official noticeoag.ca.gov
California Attorney General breach notice: T-Mobile USA
Official noticein.gov
Indiana Attorney General 2015 data breach report: T-Mobile USA
Official noticemaine.gov
Maine Attorney General breach notice archive: T-Mobile USA

Notices filed

Residents of CAOct 1, 2015
California AGCount not stated
Residents of INOct 1, 2015
Indiana AG224,467 people
Residents of MEOct 1, 2015
Maine AG12,952 people

Other breaches at T-Mobile USA

Hacking breachHacking, data exposed not stated. Reported to the Washington AG.TelecomUSJan 19, 2023Hacking breachHacking, data exposed not stated. Reported to the California AG.TelecomUSAug 24, 2021Breach, details not statedBreach notice filed with the Indiana AG, details not stated.1,027 affectedTelecomUSMar 10, 2020
History of this record
data_types2026-09-25
[] to ["names","ssn","government-id","payment-card"]by backfillSource
source2026-09-25
empty to https://www.in.gov/attorneygeneral/consumer-protection-division/id-theft-prevention/files/DB-Year-to-date-Report-2015.pdfby 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.

Everything about T-Mobile USA