Use this method to hard reset your Samsung SPH-M800 Instinct phone: Enter *2767*3855#. Warning! All your data including contacts, messages etc. will be lost! Copy all your necessary data/Contacts/Messages etc. to SIM or make backup to your PC before full reset! Take out SIM card before full reset.
or
Menu > Settings > RESET > You will see a Samsung Instinct reset code on the screen. Press Proceed then enter the reset code press HOME key. Phone will reset itself in a few min.
If you know the hard reset using buttons / keys, pls leave a comment. All comments are welcome! :)