Apple quietly added ‘Inactivity Reboot’ in iOS 18.1 to safeguard a lost or stolen iPhone
404 Media reported that iPhones stored by police in evidence were rebooting themselves, and it turns out it’s all due to a new Inactivity Reboot feature shipping in iOS 18.1. First reported by security researcher Jiska Classen, this new feature reboots your iPhone if it has gone unused for at least four days.