T-Mobile severed a third-party network connection to stop an intrusion by Salt Typhoon, a Chinese state-sponsored hacking operation, while AT&T and Verizon suffered deeper breaches. T-Mobile’s engineers detected the intrusion early, identified the entry point through a third-party wireline provider, and cut the connection before sensitive data was exfiltrated. Chief Security Officer Jeff Simon stated that no customer data, including calls, texts, or voicemails, was accessed during the incident. Salt Typhoon’s campaign targeted communications of high-value individuals across multiple US telecommunications carriers. T-Mobile attributed its success to detection speed and its segmented network architecture, which enabled it to contain the breach.
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