[header] How to reset your samsung galaxy s4 [title] Press and hold the power button for at least ten seconds until the screen turns off. [step] 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. [title] Power your phone back on as your normally would. 
[title] Turn the phone over and remove the back by sliding it off. [step] If your phone will not turn off, even after holding the power button, you'll need to remove the battery from the phone.