Turning phone off
My IPHONE 11 won’t turn off when I push the side button
iPhone 11, iOS 15
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You need to press both the side button and a volume button at the same time. See the following from Restart your iPhone - Apple Support
How to restart your iPhone X, 11, 12, or 13
- Press and hold either volume button and the side button until the power off slider appears.
- Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force restart your device.
- To turn your device back on, press and hold the side button (on the right side of your iPhone) until you see the Apple logo.
If needed also see the following from that same support article:
Can't restart?
Learn what to do if your iPhone is frozen, doesn't turn on, or doesn't respond.