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Am I missing something? How would the devices be "talking" to one another to force the restarts if the device also in the faraday box exhibited the same issue?
Could be a specific tone being generated and heard by other devices. RF signals are not the only method of communication.
 
Don’t worry, police, I’m going to guess that Apple will be forced to create the coveted “back door” soon.

Surely the mere fact that this is even a thing shows that they already have? This Cellebrite kit has been around for years. If Apple really wanted to, or rather, were allowed to, they could have 'fixed' this weakness a long time ago. In the end Apple and every other tech company will do whatever they're required to do by law in order to operate in markets were they wish to do business. And that includes keeping users in the dark vis-à-vis the clandestine machinations of the state, so at this point in time I think it's wise to assume that everything you own in the digital space is already compromised.
 
I am betting that the reboot is a bug, not a feature. But now that it seems to work, maybe in the future Apple will do this intentionally.

But the idea that somehow an iPhone running IOS18 can cause an iPhone still on IOS 17 to reboot is nearly impossible.
 
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Why would they have random phones talk to each other rather than just rebooting if the phone hasn't been connected to cellular for awhile in iOS 18 itself?
Find My?

My guess would be that it try's to communicate the location via bluetooth or wifi and trying any way possible, including pinging nearby phones. Maybe there is some kind of network wake function baked in?
 
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But as it’s a new iOS it could easily just be a bug, too.
That was my first thought as well - sort of a parallel to the old saying "never attribute to malice that which can be explained by incompetence". :p

And actually, it hasn't exactly been uncommon for me to wake up in the morning, pick up my phone and see "Your passcode is required when iPhone restarts" for quite a few years.
 
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So now random reboots is a security feature?!?!
Now that you mention it I get frequent calls for my password, not reboots. I listen to Audiobooks while going to sleep with a CPAP nose breather on the facial recognition does not work so it is password time or my Apple Watch opens it. This is why I wish Apple would bring back the fingerprint reader on the iPhone.
 
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This goes back to at least iOS 17. I noticed my iPad sometimes restarts itself when I'm not using it for more than half a day (it's noticeable from the "... requires passcode lock after restart..." notice). It's a cellular iPad and the cellular network indoors isn't great. So there's a good probability that whenever the device loses the cellular network and hasn't been used for a long time, it reboots itself.
 
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NSA and other nations Intelligence Agencies probably have a couple of zero-days for iOS and macOS. If you think otherwise you’re too naive. They don’t give out these zero-days to ordinary cops. So in the end if 3 letter agencies really want to unlock your phone they’ll do it
 
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For you folks that are supportive of a feature like this I hope you are never the victim of a horrible crime that can not be solved or is delayed because of this. When did protecting the criminals over the victims become a thing.

Few could argue against your point here, but this is why victims don't, or at east shouldn't, get to have a say in policy. I'm certainly not going to challenge the thrust of your argument, but there's a fine line where genuine suspicion and due process becomes dragnet surveillance and invasion of privacy on the grounds of pre-supposed guilt according to, well, whomever is currently in charge of whatever. The cops cracking your phone legitimately in a murder case just as easily becomes the cops smashing your door off its hinges and cracking your phone because you committed wrongthink on social media. All that separates the two is time.
 
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