Apple quietly introduced code into iOS 18.1 which reboots the device if it has not been unlocked for a period of time, reverting it to a state which improves the security of iPhones overall and is making it harder for police to break into the devices, according to multiple iPhone security experts.
On Thursday, 404 Media reported that law enforcement officials were freaking out that iPhones which had been stored for examination were mysteriously rebooting themselves. At the time the cause was unclear, with the officials only able to speculate why they were being locked out of the devices. Now a day later, the potential reason why is coming into view.
“Apple indeed added a feature called ‘inactivity reboot’ in iOS 18.1.,” Dr.-Ing. Jiska Classen, a research group leader at the Hasso Plattner Institute, tweeted after 404 Media published on Thursday along with screenshots that they presented as the relevant pieces of code.
It does, labled “Auto Restart”, but only when “preformance issues detected” or time specified. Apple is quite late on this feature.
on GrapheneOS it is labeled auto reboot and it specifically says “automatically reboot device if it hasn’t been unlocked in xxx hours” with a default of 18.
This is clearly the Samsung interface and thus not stock Android. Doesn’t even really look like the same feature.
Does that stop alarms from going off in the morning?
depends on your phone. at first encryption was done in an all-or-nothing style, so system startup couldn’t complete without a first unlock. then android started using file based encryption, which was used selectively, encrypting certain things so that they are accessible without an unlock.
the best way to figure it out is to set a new alarm 10 minutes from now, reboot your phone manually, and see whether the alarm goes off
I’m on S21FE and it does NOT.