iPhone Xr

Force restart iPhone - Apple Support ⬅︎ try this...

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1. Press and quickly release the volume up button.
2. Press and quickly release the volume down button.
3. Press and hold the side button.
4. When the Apple logo appears, release the button.

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

Try Recovery Mode...⬇︎⬇︎⬇︎Full instructions in link...⬆︎⬆︎⬆︎

Connect your device to a computer. On a Mac with macOS Catalina 10.15, open Finder. On a Mac with macOS Mojave 10.14 or earlier, or on a PC, open iTunes.

 Press and quickly release the Volume Up button. Press and quickly release the Volume Down button. Then, press and hold the Side button until you see the recovery mode screen.

If you can't activate your iPhone - Apple Support