T-Mobile security incident history
Hacking, data breaches and other security incidents involving T-Mobile, with related coverage.
T-Mobile responds to recent data leak reports
T-Mobile responded to recent reports of a data leak. The specific scope of the leak and the content of the explanation have not been confirmed.
Read on SecurityWeek ↗Hackers targeting T-Mobile claim theft of 64 million records
64mImpact: Claimed theft of 64 million records; actual damage unconfirmed
Hackers targeted T-Mobile again and claimed to have stolen 64 million records. Whether the data was actually stolen, the types of information and T-Mobile's response have not been confirmed.
Read on Cybernews ↗T-Mobile data breach affects 37 million customer accounts
Impact: 37 million customer accounts
Customer data was leaked at T-Mobile, affecting 37 million accounts. The specific date of the incident and the response have not been confirmed.
Read on CyberGhost VPN ↗T-Mobile confirms it was hit in China-linked hack of US telecoms networks
T-Mobile was hacked in a China-linked cyber-espionage campaign targeting US telecommunications networks. It confirmed the hack in November 2024 and later released additional information about the attack.
Related reports: 6 · last report →T-Mobile hack exposes customers' personal data
A hack at T-Mobile in the US led to a leak of customers' personal information. It was followed by a fine, a pledge to prevent recurrence, and compensation for affected customers. Compensation of up to 32 million won per affected customer and a total compensation figure of 459 billion won were reported.
Related reports: 3 · last report →T-Mobile settles with US regulators over repeated data breaches
T-Mobile suffered repeated data breaches over several years. On 30 September 2024, T-Mobile agreed to a settlement totalling $31.5 million to resolve related US Federal Communications Commission investigations and allegations, and pledged to improve its cyber security.
Related reports: 9 · last report →T-Mobile hit with $60 million penalty over data breach
Unauthorised data access and a data breach occurred at T-Mobile. The Committee on Foreign Investment in the United States (CFIUS) fined T-Mobile $60 million over the unauthorised access and its breach response.
Related reports: 3 · last report →T-Mobile links leaked data to supplier breach
Data related to T-Mobile was leaked. T-Mobile denied claims that it had been hacked and linked the leaked data to a breach at a supplier.
Read on BleepingComputer ↗T-Mobile breach exposed 79 million customer records in 2021
79mImpact: 79 million customer records
A data breach at T-Mobile exposed 79 million customer records in 2021. A US$350 million settlement payout for affected customers was pursued, with reports in 2025 of payment delays and victims receiving payouts. Washington state brought legal action against T-Mobile over the incident, and a court ruled in 2026 that the company had breached Washington's data breach notification law.
Related reports: 14 · last report →