My phone
when I go to press on apps I’m not allowed to and when I get call and such the screen turns grey
iPhone X, iOS 15
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Force restart your phone:
- Press and quickly release VOLUME UP
- Press and quickly release VOLUME DOWN
- Hold the SIDE button until an Apple logo appears (15-30 seconds), ignoring "slide to power off"
The operative word here is QUICKLY; and try it a couple of times, the timing is a little tricky.