iPhone turning off

Try a forced restart.

• Press and quickly release the volume up button

• Press and quickly release the volume down button

• Press and hold the side button.

• When the Apple logo appears, release the button.

Force restart iPhone - Apple Support (IN) Force restart iPhone - Apple Support (IN)

angeline11 Said:

"iPhone turning off: I try and go to another app or when I try to unlock iPhone. It turns off and loads"

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Getting Out of a Boot Loop:

Your iPhone is apparently stuck in a boot loop. This typically happens when an update stalls.  So, refer to my User Tip: How to Fix an iPhone in a Boot Loop - User Tip