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> Graphene OS has a duress password and PIN, which “will irreversibly wipe the device (along with any installed eSIMs) once entered anywhere where the device credentials are requested.”

iOS kinda also offers such a solution, though a bit more suspicious to perform: "Erase all data on this iPhone after 10 failed passcode attempts"

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Can be set to less attempts via MDM profiles.

Same for Android.

But if the data is backed up on iCloud, Apple will provide it with a warrant.

Turn on Advanced Data protection, which encrypts it so Apple can give them the data, but they don't have the keys to decrypt it. Doesn't help if the other person you're talking to doesn't have it turned on though.

But how will they prove which Apple account was just wiped from that iPhone?

iPhones have unique identifiers. So do you, via your set of emails used. The email maps to the iCloud account, which then maps to the iPhone. It would be trivial to map a backup to an iPhone.

Ah yes that makes sense, they can retrieve the iPhone's serial number and warrant Apple to handover the associated iCloud backup.

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