iPhones will auto-reboot after 3 days of inactivity

[Bubble99]

iPhone will auto-reboot after 3 days of inactivity.​

No more at the lock screen now.

The tech giant is rolling out a new security feature that will automatically restart a device that has been locked and inactive for three consecutive days.

Apple introduced a similar feature dubbed inactivity reboot with iOS 18.1 near the end of 2024. After a few days of inactivity, an iPhone equipped with the feature will automatically reboot itself. Most consider this an added layer of security, as a rebooted device is more difficult to break into and extract data from.

No more sitting at the lock screen. You must turn the device on again after three days of inactivity.

 

[Cobold]

First:
the feature was introduced with 18.1 as stated in your post. The news here is that google is now implementing a similar feature in Android, iPhones do this since the end of 2024, so no news here.
That is what‘s the news:

[Update: Optional] Google rolling out auto-restart security feature to Android

With the latest Play services update, Google is rolling out a new auto-reboot security feature that automatically restarts Android devices...

9to5google.com

Second:
the phone reboots and does not turn off!
So of course you are still seeing the Lock Screen, but the device then sits in the so called BFU state - before first unlock - making it harder to access data. You have to manually unlock it via the PIN as if you did a reboot yourself.

 

[NoBoMac]

Discussion in News about this.

https://forums.macrumors.com/threads/ios-18-security-feature-causes-iphone-to-reboot-after-three-days-of-inactivity.2443013/