T-Mobile confirms of new data breach by SIM swap attacks

T-Mobile confirmed that recent reports of a new data breach are linked to notifications sent to a "very small number of customers" who fell victim to SIM swap attacks.

According t a T-Mobile spokesperson, "We informed a very small number of customers that the SIM card assigned to a mobile number on their account may have been illegally reassigned or limited account information was viewed. Unauthorized SIM swaps are unfortunately a common industry-wide occurrence, however this issue was quickly corrected by our team, using our in-place safeguards, and we proactively took additional protective measures on their behalf."

SIM swapping (also known as SIM hijacking) makes it possible for attackers to take control of a target's mobile phone number by tricking or bribing the carrier's employees to reassign the numbers to attacker-controlled SIM cards.

This enables the threat actors to take control of their victims' phone numbers and use them to bypass SMS-based multi-factor authentication (MFA), steal their credentials, log into the victims' bank accounts to steal money, or hijack their online accounts by changing the passwords.

All T-Mobile customers are on the lookout for any suspicious text messages or emails pretending to be from T-Mobile. Don't click any links if receive one, as attackers could use them to harvest your credentials.