Unresponsive iPhone 13 that is brand new
My iPhone 13 that is brand new is unresponsive if I am asked to press a number while on the phone
iPhone 13, iOS 16
If iPhone isn't responding, and you can force restart it. Press and quickly release the volume up button. Press and quickly release the volume down button. Press and hold the side button
If your iPhone won't turn on or is frozen – Apple Support (UK)