Jiska Classen explored why iPhones running iOS 18 reboot after three days of inactivity, confirming a 72-hour timer, yet found no evidence of intra-device communication triggering reboots.
The undocumented Inactivity Reboot feature reduces the risk of unauthorized data access by enabling devices to enter a more secure state after prolonged inactivity.
When an iPhone reboots, it enters Before First Unlock (BFU) state, significantly increasing its security as files become encrypted until a valid passcode is entered.
Security features in iOS 18 limit access opportunities, especially for law enforcement, by ensuring devices remain secure through periodic reboots if not used.
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