Samsung SGH-T999MBATMB - Manual (Page 74)

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Factory Data Reset
From this menu you can reset your phone and sound settings
to the factory default settings.
1. Press ➔ and then tap Settings ➔ Back up
and reset.
2. Tap Factory data reset. This action erases all data from
your device except current system software and
bundled applications, or SD card files such as music or
photos.
Note: This feature provides an option to format the internal
USB storage, not the microSD card.
3. Tap Reset device ➔ Delete all.