Samsung SPH A740 - Manual (Page 136)

127 Phone Security
Resetting Your Phone
Resetting the phone restores all the factory defaults, including the
ringer types and display settings. The Contacts, Call History,
Scheduler, and Messaging are not affected.
To reset your phone:
1. From the Security menu, press for Reset Phone.
2. Using the navigation key, select Yes and press .
3. Using the navigation key, select Yes again to confirm and
press . Your phone will reset.