My father had the same problem so we called apple support and this is what they had us do. If the side bottom and one of the volume bottoms don’t work to reset your phone try pressing the volume up then volume down button quickly then holding side button until the power off screen comes on. Slide power off then wait for a few seconds before turning it back on. Make sure you can open your apps. To ensure it works reset again and wait ten seconds then turn back on.
Alexis_Phipps04
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