T-Mobile’s announcement came after an anonymous hacker claimed to have sensitive personal information on more than 100 million people including 30 million unique SSNs that had never been sold to anyone before.
The stolen data includes social security numbers, phone numbers, names, physical addresses, unique IMEI numbers, and driver’s licenses information, the seller said in an underground forum as reported by Motherboard.
T-Mobile said in a statement Monday afternoon, “We have determined that unauthorized access to some T-Mobile data occurred, however, we have not yet determined that there is any personal customer data involved,”
“We have been working around the clock to investigate claims being made that T-Mobile data may have been illegally accessed,”
The company added, “We are confident that the entry point used to gain access has been closed, and we are continuing our deep technical review of the situation across our systems to identify the nature of any data that was illegally accessed,” the company said in a news release.
This is not the first time T-Mobile has been targeted in a data breach. In December 2020, phone numbers and call-related information of T-Mobile customers have been illegally accessed but no sensitive information such as names and Social Security numbers were included.