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How to reset your samsung galaxy s4
Press and hold the power button for at least ten seconds until the screen turns off.
If your s4 has frozen while you are using it and none of the buttons are responding, you can try to force it to shut down.
Power your phone back on as your normally would.
Turn the phone over and remove the back by sliding it off. If your phone will not turn off, even after holding the power button, you'll need to remove the battery from the phone.