"Peephole" in the Ether: The Unseen Surveillance of Our Smartphones Chinese researchers have developed a method that can identify smartphone applications and user actions through low frequency electromagnetic radiation, even when the device is offline or locked.
This non contact forensic technique raises questions about the boundaries between digital and physical security. The system works by analyzing the faint electromagnetic signals emitted as devices operate.
In essence, it creates a peephole into our private lives without direct access to the phone's operating system or stored data.