WARNING; This May and Will mess up your phone if you do not know what you are doing! I can not help you if you do mess up your phone, be sure you made a back up or that google sync is working. Play around at your own risk! Take out the battery, put it back in. Simultaneously press Call(Green/Send key ) Enter(Middle Trackpad) End(Red/Hang Up) buttons on bottom portion of front face. It will turn on and display "Samsung" and fill a grey bar, then turn yellowish, poof you are now at the self test menu. From there, go to reset and you should be able to hard reset the device.