Malicious SIM Cards: A Growing Threat to Smartphone Security
Researchers have discovered that compromised or malicious SIM cards can hijack smartphones, steal files, and lock them onto 2G networks. This is made possible by a legitimate function built into the cellular spec called Proactive SIM, which allows a card to send commands to devices. The attack does not require physical access to the device, and its severity is high due to the potential for information theft and disruption of communications.