T-Mobile US Data Breach History

This page tracks the T-Mobile US data breach history and cybersecurity incidents affecting T-Mobile US (United States). BreachHistory currently indexes 6 publicly disclosed or catalogued incidents spanning 2006 through 2023, with approximately 144.0 million records reported as exposed across all indexed events. These totals may include overlapping datasets or third-party estimates and should not be interpreted as unique affected users.

The T-Mobile US breach timeline includes major data breaches, cyber attacks, data leaks, credential exposures, API abuse, and other security incidents. Each incident provides details on the estimated records exposed, attack method, affected data types, and supporting public sources. Currently, 0 incidents are company-confirmed.

Largest T-Mobile US Data Breaches

The largest indexed incidents include the 2021 T-Mobile breach — 50M+ records, the 2023 API breach — 37M customer records, and the 2010 — T-Mobile US: Thieves got their hands on a storage device with…, along with additional historical incidents involving exposed passwords, public databases, and large-scale data scraping. Record counts originating from threat actors or leak sites should be treated as estimates unless confirmed by T-Mobile US or a regulator. Below is the list of large data breaches:

• 2021 2021 T-Mobile breach — 50M+ records — about 54.0M records exposed · Catalogued incident
• 2023 2023 API breach — 37M customer records — about 37.0M records exposed · Catalogued incident
• 2010 2010 — T-Mobile US: Thieves got their hands on a storage device with… — about 17.0M records exposed · Catalogued incident
• 2008 2008 — T-Mobile US: Thieves got their hands on a storage device with… — about 17.0M records exposed · Catalogued incident
• 2006 2006 — T-Mobile US: Thieves got their hands on a storage device with… — about 17.0M records exposed · Catalogued incident
• 2018 2018 — T-Mobile US: T-Mobile initially said that personal data was… — about 2.0M records exposed · Catalogued incident

What Information Was Exposed?

Depending on the incident, exposed data may include email addresses, passwords and login credentials, Social Security numbers and national IDs, phone numbers, names, physical addresses, and other personal information (PII). The exact data varies between incidents, so review each breach page before assuming your information was affected.

T-Mobile US Data Breach 2026

At the time of this update, no T-Mobile US data breach has been catalogued for 2026. New incidents are added as official disclosures, regulatory filings, or credible cybersecurity reports become available.

What To Do If You Were Affected

If you believe your account may have been involved in a T-Mobile US data breach, change any reused passwords, enable multi-factor authentication (MFA), monitor your account for suspicious activity, and be cautious of phishing emails or fake breach notifications.

This T-Mobile US breach history is maintained by BreachHistory using public disclosures, regulatory filings, security research, and clearly labelled third-party claims. For the complete breach timeline, records exposed, incident details, and AI Breach Risk Score, explore the sections on this page.