Magnet Forensics have confirmed this feature for themselves, and noted that iOS 18 initially set the reboot time for seven days. However iOS 18.1 shortened the countdown to three days, and pointed out there are no prompts or warnings that give any indication an automatic restart is on the way.

Apple's iOS 18.1 auto-reboot feature locks iPhones after four days, blocking easy access, but at the same time, frustrating law enforcement in forensic probes.

With iOS 18, Apple introduced a feature that causes the iPhone to reboot every three days, security researchers have confirmed (via TechCrunch). In

Apple's iOS 18 introduces new security features, including a 3-day auto reboot, to enhance iPhone protection against theft.