DEUTSCHE TELEKOM AG

T-Mobile, USA reported an insider wrongdoing incident to the Maine Attorney General. An unauthorized individual accessed limited information on one Maine resident's account on January 12, 2026. The breach was discovered on March 5, 2026. Affected data included name, address, email, account number, phone numbers, PIN, driver's license, DOB, and SSN. T-Mobile reset the account PIN and offered 24 months of credit monitoring. Notification was sent on March 31, 2026.

T-Mobile reported a data breach to the Indiana Attorney General. The breach occurred on 2025-06-10 and was reported on 2025-08-29. 1 Indiana residents were affected. 2 individuals affected in total.

T-Mobile USA reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2023-04-28. 17 Massachusetts residents were affected. The report records the breach type as electronic.

T-Mobile, USA experienced a security breach between February 24, 2023, and March 30, 2023, which was discovered on March 27, 2023. The breach, described as an external system hack, affected 836 individuals. The compromised information included names in combination with driver's license or non-driver identification card numbers. T-Mobile notified the affected individuals on April 28, 2023, and offered 24 months of complimentary credit monitoring and identity theft protection services through Transunion.

T‐Mobile reported a data breach to the Indiana Attorney General. The breach occurred on 2023-02-24 and was reported on 2023-04-28. 7 Indiana residents were affected. 836 individuals affected in total.

T-Mobile US, Inc. notified the New Hampshire Attorney General that a bad actor gained unauthorized access to limited information from a small number of T-Mobile accounts between late February and March 2023. One New Hampshire resident was affected. The compromised data included account PINs. T-Mobile reset the PINs, shut down access, and provided two years of free credit monitoring.

T-Mobile US, Inc. disclosed that a bad actor obtained data through an unauthorized API access starting around November 25, 2022. The company identified the activity on January 5, 2023, and contained it within a day. Approximately 37 million customer accounts were affected, exposing basic identity information such as name, address, email, phone number, and date of birth. Sensitive data like SSNs and payment card information was not accessed.

T-Mobile USA reported unauthorized access to customer account information in Washington. The breach, discovered on Jan 5, 2023, affected names, contact details, and DOBs. Passwords and SSNs were not compromised. 772,593 Washington residents were notified.

T-Mobile reported a data breach to the Massachusetts Office of Consumer Affairs and Business Regulation. The breach was reported on 2022-03-08. 1 Massachusetts residents were affected. The report records the breach type as paper.