iPhone is charging but screens remains black
Phone charging but screen remains black. Fixes?
[Re-Titled by Moderator]
iPhone 12, iOS 15
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Phone frozen or will not turn on
Start here
If your iPhone won't turn on or is frozen – Apple Support (UK)
or watch this video
https://youtu.be/2CRilTPouRU?t=97
There is no guarantee you can save any data since your last backup if you need to use the Restore option.