My iPhone screen is stuck on the spinning gear

Try a force restart. Press and very quickly release the volume up button, press and very quickly release the volume down button, then press and hold the side button for about twenty seconds. When the Apple logo appears, release the button. The timing is a little tricky, so try it a few times!

Force restart iPhone - Apple Support

GearMong wrote:

My iPhone screen is stuck in the spinning gear and won’t reboot. Any suggestions?

What were you doing with your phone prior to it getting stuck?