Every public data breach

Disclosed this week44On record26,355

44 disclosed this week · 26,355 on record

T-Mobile

Disclosed Dec 31, 2013Confirmed

Official notice

What is known

People affectedNot stated in the sources we have
DisclosedDec 31, 2013
AttackNot stated
Data exposedNamesSocial Security numbersGovernment IDsAddressesNames
SectorTelecom · US
StatusConfirmed

Sources

Official noticemaine.gov
Maine Attorney General breach notice archive: T-Mobile

Notices filed

Residents of MEDec 31, 2013
Maine AG15 people

Other breaches at T-Mobile

Breach, details not statedBreach notice filed with the Indiana AG, details not stated.2 affectedTelecomUSAug 29, 2025Abused API leaks account data of 37 million T-Mobile customersHacking exposed names, addresses, emails, phone numbers and dates of birth. Reported to the Indiana AG.Hacking37M affectedTelecomUSJan 19, 2023Cyberattack steals data of tens of millions of T-Mobile customers and applicantsHacking exposed names, government IDs, source code, internal documents, dates of birth, Social Security numbers and phone numbers. Reported to the Delaware DOJ.Hacking54M affectedTelecomUSOct 9, 2020
History of this record
Added2026-09-25
First recordedby backfillSource

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

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