The move comes after Motherboard reported that T-Mobile was investigating a post on an underground forum offering for sale Social Security Numbers and other private data. The forum post at the time didn't name T-Mobile, but the seller told Motherboard the data came from T-Mobile servers.
"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 in its new announcement . "This investigation will take some time but we are working with the highest degree of urgency. Until we have completed this assessment we cannot confirm the reported number of records affected or the validity of statements made by others," the announcement added.
Do you work at T-Mobile and know anything else about this breach? We'd love to hear from you. Using a non-work phone or computer, you can contact Joseph Cox securely on Signal on +44 20 8133 5190, Wickr on josephcox, or email firstname.lastname@example.org.