how to delete my i phone X if the screen is black and find my phone is switched off
how to delete my personal details from i phone X if the screen is black and find my phone is switched off
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Unless your screen comes back to life, you can't delete your personal data from your iPhone.
However, Apple prepared a list or things to do for such cases, to make sure your data stays protected:
If Find My iPhone or Find My iPad isn't enabled on your missing device - Apple Support