T-Mobile US and its unit Metro PCS informed customers on Thursday about a potential security breach that was discovered and shut down by the company.
T-Mobile said that on Aug. 20 its cyber-security team discovered and shut down an unauthorized access to certain information, and the company reported the breach to authorities. T-Mobile said financial data and credit card information, social security numbers and passwords were not compromised. However, some personal information may have been accessed, including name, billing zip code, phone number, email address, account number and account type.
About 3 percent of T-mobile's 77 million customers could have been affected, a company spokesperson told technology news website Motherboard.
T-Mobile said it informed customers of the incident "out of an abundance of caution."