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An interesting idea for an app which resets the iPhone after some idle time, or if iPhone loses contact with the apple watch. To prevent AFU exploits.

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The Signal app, to the best of my understanding, does have a built in dead man's switch in the form of the PIN system. You can apparently set the time range in the settings.

Signal PIN currently serves a different purpose: it enables registration lock, which is a defense against number porting attacks. https://support.signal.org/hc/en-us/articles/360007059792-Si...

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