Method 1: Normal Restart Method

1. Press and hold the volume up button and the power button until the power slider appears.
2. Drag the slider, to turn off your iPhone.

3. After the device turns off, wait a few seconds, then press and hold the power button until the device turns back on.

Method 2: Forced Restart Method

1. Quickly press and release the volume up button.
2. Quickly press and release the volume down button.
3. Press and hold the side power button.
4. Release the button after the Apple logo appears and wait for the iPhone to startup.

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