Samsung SGH-T959ZKBTMK - Manual (Page 48)

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Factory Data Reset
From this menu you can reset your phone and sound settings to
the factory default settings.
1. From Idle mode, touch ➔ Settings ➔ Privacy.
2. Touch Factory data reset.
This action erases all data from your phone except current
system software and bundled applications, or SD card files
such as music or photos.
3. Touch Reset phone.