T-Mobile hit with a data breach
Documents show that bad actors targeted user accounts and engaged in 'unauthorized activity' in the form of SIM swapping or spying of the user's customer proprietary network information (CPNI).
SIM swapping is a method of circumventing two-factor authentication by changing the victim's physical SIM card, which allows hackers to gain access to other accounts associated with that device such as bank accounts.
Furthermore, users who have had their CPNI exposed may have their personal information stolen such as their billing account, account numbers, phone numbers and plan information. Also, some users may have been affected by both SIM swapping and spying of their CPNI.
On a positive note, the data breach seems not to be widespread and the document purports that the SIM swaps have been addressed and compromised accounts are being monitored.
T-Mobile is taking immediate steps to help protect all individuals who may be at risk from this cyberattack. If you have any questions, send us a DM and we can discuss steps to increase your account security. ^KenStone— T-Mobile Help (@TMobileHelp) December 28, 2021