If you want to restart your iPhone 12 or iPhone 12 mini to troubleshoot problems or just to save battery, it's easy to do. Here are two very easy ways.

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How to Turn Off an iPhone 12 with Hardware Buttons
To turn off an iPhone 12 or iPhone 12 mini using its buttons, press and hold the side button (on the right side of the iPhone) and the volume up button (on the left side).

Hold down both buttons until a “slide to power off” slider appears on the screen. Then, place your finger on the white circle on the slider and slide it to the right.

After this, the iPhone 12 will shut down and turn off completely.
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Second way to turn off an iPhone 12
You can also turn off an iPhone 12 or iPhone 12 mini using a software switch built into the iOS operating system. To use it, first open the Settings app.

In Settings, select “General”.

In “General,” swipe down to the bottom of the list and tap “Shut Down.”

After tapping “Shut Down,” the power off slider will appear. Slide it to the right to turn off your iPhone 12.

And you're done, your iPhone 12 is turned off.
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If you just turned off your iPhone to troubleshoot a problem, you might want to wait a while before turning it back on. When you're ready to turn it back on, press and hold the side button (on the right side of the unit) for a few seconds until you see the Applelogoscreen .
Information source: howtogeek.com
