iPhone won't turn off and frozen

see the process below. Work all through it.

If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support

There is no guarantee you can save any data since your last backup

Have you tried a hard/force reset? If not, this might help: https://support.apple.com/guide/iphone/force-restart-iphone-iph8903c3ee6/ios

SmooveKK ~ What iPhone model is it? And does it still have its original battery?

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