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. Play around at your own risk!
Take out the battery, put it back in. Simultaneously press [Send] + [Center Track] + [End] 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.
Enjoy, don't forget to click thanks if you found that helpful.
-CC