The hacker(s) claim the purloined data also includes IMSI and IMEI data for 36 million customers. They claim one of those databases holds the name, date of birth, SSN, drivers license information, plaintext security PIN, address and phone number of 36 million T-Mobile customers in the United States - all going back to the mid-1990s. From there, the intruders were able to dump a number of customer databases totaling more than 100 gigabytes. Und0xxed said the hackers found an opening in T-Mobile’s wireless data network that allowed access to two of T-Mobile’s customer data centers. Reached via direct message, Und0xxed said they were not involved in stealing the databases but was instead in charge of finding buyers for the stolen T-Mobile customer data. The intrusion came to light on Twitter when the account started tweeting the details. Until we have completed this assessment we cannot confirm the reported number of records affected or the validity of statements made by others.” “This investigation will take some time but we are working with the highest degree of urgency. “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 statement continued.

“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,” T-Mobile wrote. A sales thread tied to the allegedly stolen T-Mobile customer data.

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