Phone hacked and unresponsive

Try forcing a restart: If your iPhone won't turn on or the screen is black - Apple Support

If that fails, contact Apple Support as the iPhone may need a hardware repair.

Select your country here: Contact Apple Support - Apple Support

“Phone hacked and unresponsive: My phone is hacked can't do anything “

———-

Troubleshooting a Stalled iPhone:

Clear "System Data" AKA "Other": Storage space may be full. So, see about clearing the caches. Use my User Tip for that: How to Clear "System Data" in your iPhone's Storage: - User Tip

Fixing a Boot Loop:

Did you just install an update? If so, your iPhone might be in a Boot Loop. This typically occurs when you go about installing an update, and it stalled while in the process. Use my User Tip: How to Fix an iPhone in a Boot Loop - User Tip