To turn off your iPhone completely, follow these simple steps:
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Go to Settings: Locate the Settings app on your iPhone's home screen (it's the one with the gear icon) and tap to open it.
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General: Scroll down and tap on "General."
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Shut Down: Scroll all the way to the bottom of the General settings and tap "Shut Down."
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Drag the slider: A "slide to power off" slider will appear at the top of the screen. Drag the slider from left to right to turn off your iPhone.
Your iPhone will now power down. To turn it back on, press and hold the side button (or the top button on older models) until the Apple logo appears.
