Apple’s latest software update, iOS 18, is enhancing iPhone security with stronger anti-theft features designed to protect user data if the device is stolen. These measures are intended to make it harder for thieves to access private information and make the iPhone a more secure device overall. Two important security changes include the addition of a “dormant reboot” feature and an improved stolen device protection option. This was first reported by 404 Media.

Jiska Klassen, a researcher at the Hasso Plattner Institute, posted a video of the iOS 18 inactivity reboot feature. The video shows that with iOS 18, Apple introduces an automatic “inactivity reboot” function that activates if the device is left unlocked for three consecutive days. This feature forces the iPhone to restart and enter a safe state called “Before First Unlock.” In this case, the iPhone’s encryption keys, which protect user data, are locked within the Secure Enclave processor. This makes it almost impossible for thieves to access the data with basic forensic tools, even if the iPhone remains turned on. As a result, the purpose of dormancy reboot is to protect sensitive data by blocking unauthorized access attempts that depend on the device being turned on.

While this reboot feature provides a significant security boost, it can also present challenges for law enforcement when attempting to extract data from criminals’ devices. However, the three-day limit is generally enough time for investigators to coordinate efforts with forensic analysts for data recovery, so it does not completely prevent legitimate data access.

Another feature that deserves attention is the Stolen Device Protection option, which is now placed more prominently during the iOS 18.2 setup process. Previously hidden within the Settings menu, this feature is now presented to users as part of the initial setup, encouraging them to enable it for added security. When activated, Stolen Device Protection requires biometric authentication (such as Face ID or Touch ID) more frequently in addition to the device PIN, making it harder for thieves to gain access to the device and any linked accounts.

With these updates, Apple is strengthening its commitment to user privacy and device security. The new anti-theft measures add layers of security that make unauthorized access more challenging, intended to give users peace of mind if their device is ever stolen. These features reflect Apple’s focus on security innovation, as the company continues to respond to the evolving landscape of digital threats. iOS 18’s advanced security updates are now available, allowing users to take advantage of these protections by making sure their devices are updated to the latest software.