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Last year, the company disclosed two more breaches, one of them in March 2020, when attackers gained access to customer and employee data. T-Mobile previously suffered from breaches in 2018 when millions of customers' info was accessed by hackers and in 2019 after exposing prepaid customers' data. This is the fifth data breach disclosed by T-Mobile during the last four years, all of them being reported after hackers gained access to customers' data. T-Mobile is offering two years of free credit monitoring and identity theft detection services through Transunion's myTrueIdentity. Impacted T-Mobile customers are advised to change their account's password, PIN, as well as their security questions and answers.
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"T-Mobile quickly identified and terminated the unauthorized activity however we do recommend that you change your customer account PIN," the company also said.
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The information accessed by the hackers might have included customers' full names, addresses, email addresses, account numbers, social security numbers (SSNs), account personal identification numbers (PIN), account security questions and answers, date of birth, plan information, and the number of lines subscribed to their accounts. "T-Mobile identified this activity-terminated the unauthorized access, and implemented measures to protect against reoccurrence."
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It appears the actor may then have used this information to port your line to a different carrier without your authorization," T-Mobile said. "n unknown actor gained access to certain account information. In a data breach notice sent to impacted customers on February 9, 2021, and filed with US attorney generals' offices, T-Mobile revealed that an unknown attacker gained access to customers' account information, including personal info and personal identification numbers (PINs).Īs the attackers were able to port numbers, it is not clear if they gained access to an employee's account or did it through the compromised users' accounts.Ī T-Mobile spokesperson was not available for comment when contacted by BleepingComputer earlier today.
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The FBI shared guidance on how to defend against SIM swapping following an increase in the number of SIM hijacking attacks targeting cryptocurrency adopters and investors. The criminals can then log into the victims' bank accounts to steal money, change account passwords, and even locking the victims out of their own accounts. Subsequently, they receive the victims' messages and calls which allows for easily bypassing SMS-based multi-factor authentication (MFA), stealing user credentials, as well taking over the victims' online service accounts. SIM swap fraud (or SIM hijacking) allows scammers to take control of targets' phone numbers after porting them using social engineering or after bribing mobile operator employees to a SIM controlled by the fraudsters. American telecommunications provider T-Mobile has disclosed a data breach after an unknown number of customers were apparently affected by SIM swap attacks.