Notes:
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This device has a non-removable battery. This process can be used to simulate a "battery pull" when the device is unresponsive, frozen or doesn't power on.
If your iPhone is powered on and responsive, refer to Restart/soft reset instructions.
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For more on how to resolve power issues with your iPhone, refer to these battery troubleshooting steps.
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Press and hold the Power button.
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Continue to hold the Power button and press and hold the Volume down button located on the left side of your iPhone.

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Hold both buttons as the iPhone powers off and back on; release both buttons when the Apple logo appears on the screen.
If you are not able to restart your iPhone using these steps, visit the Apple Support page.