To restart an iPhone, you can follow these steps:
1. Press and hold the power button on the side (or top) of your iPhone.
2. Wait for the "slide to power off" slider to appear on the screen.
3. Slide the slider to power off your iPhone.
4. Once your iPhone is completely powered off, press and hold the power button again until the Apple logo appears on the screen.
5. Release the power button and wait for your iPhone to restart.
Your iPhone should now be restarted and ready to use.
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