Security News > 2021 > February > T-Mobile discloses data breach after SIM swapping attacks
American telecommunications provider T-Mobile has disclosed a data breach after an unknown number of customers were apparently affected by SIM swap attacks.
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.
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.
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 previously suffered from breaches in 2018 when millions of customers' info was accessed by hackers and in 2019 after exposing prepaid customers' data.
In December 2020, T-Mobile's suffered another data breach after unknown threat actors again accessed customers' phone numbers and call records.
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