At "Erase Data" under "Passcode" under "Settings" at your iPhone you may flip the setting on and when someone is trying to punch in the pin for your phone with a bad guess ten times in a row it will wipe your phone's data. This is the only way to protect your data from a circumstance in which someone takes physical possession of your cellie and then guesses your 4 digit pin with a brute force attack as there are only ten thousand possibilities for a 4 digit pin. The American government would like the ability to push an update to an iPhone in DFU (data firmware update) mode which undoes this safeguard setting allowing for brute force entry without consequence. They request as much from Apple and so far Apple will not oblige. One enters DFU mode by plugging their phone into iTunes and then pressing the top button and the main button together as if otherwise powering the phone off. In DFU mode, updates may be pushed to the device without a password being entered!
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