Samsung SPH-M520ZSAQST - Manual (Page 114)

88 Section 2C: Setting Your Phone’s Security
Resetting Your Phone
Resetting the phone restores all the factory defaults, including the ringer
types and display settings. This type of reset also deletes any data found
within the Contacts list, special numbers, and pic/video folders.
To reset your phone:
1. Select Menu > Settings > More > Security.
2. Enter your lock code. (The Security menu is displayed.)
3. Select Erase/Reset > Reset Phone and press .
4. If you are certain that you would like to reset your phone to its
factory settings, select Yes from the Reset the Phone? dialog or
No to cancel the operation, and press
.