T-Mobile Exposed Customer Data in Repeated Breaches and Leaks

T-Mobile disclosed a major cyberattack that exposed personal information tied to more than 40 million current, former, and prospective customers, including names, dates of birth, Social Security numbers, and driver's license details. The company said the intrusion targeted customer records and prompted an ongoing investigation, while reporting indicated the breach affected both existing subscribers and people who had previously applied for credit with the carrier.

The carrier was hit again in later incidents, underscoring persistent security problems despite a reported $150 million investment in cybersecurity. In early 2023, T-Mobile disclosed another breach affecting customer account data, and later that year a separate exposure involving roughly 90GB of data surfaced on a hacker forum and was linked to a T-Mobile glitch, raising fresh concerns about the company's ability to prevent repeated leaks of sensitive customer information.