phone is not turning on

(1) Try and Force Restart your iPhone EXACTLY as shown below and see whether that resolves the issue:

• Press and quickly release Volume UP button
• Press and quickly release Volume DOWN button
• Press and Hold the SIDE button until an Apple logo appears and then release the Side button (Can take up to 20 seconds. (DO NOT release Side Button when invited to Slide Power OFF). 

(2) If the above does not work then - Follow the instructions in this article by Apple ➔ If your iPhone is Non-Responsive or Frozen and see if that helps.

Axel F.

terka144 Said:

"phone is not turning on: The whole day my phone is glitching, when I try to restart it,it stayed on the Apple screen and it doesn't do anything. When are trying to push some buttons it still doesn't work and it's not doing anything, it stayed on the Apple screen and it doesn't do anything. When are trying to push some buttons it still doesn't work and it's not doing anything"

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Being Stuck in a Boot Loop:

You might have an iPhone stuck in a boot loop. And this typically happens when you unsuccessfully download somethings or an install stalls.  So, refer to my User Tip: How to Fix an iPhone in a Boot Loop - User Tip