Samsung Galaxy secret code : Reset (Hard or Factory)

Dial the following number on your screen

Hard Reset

Code Block

1	*2767*3855#

or

Factory Reset

Code Block

1	*#*#7780#*#*

Hard Reset : reformat the FirmWare, wipe out files and settings in internal memory.
Factory Reset: restore phone to factory settings, wipe out account, contact, application settings.