Samsung SCH-3500 - Manual (Page 83)

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Resetting your phone.
Resetting the phone erases all Internal Phone Book entries,
Sprint PCS Voicemail, numeric pages, text messages, call
logs, special numbers, and returns all saved options to the
default settings.
To reset the phone:
1. Press to display the Main Menu.
2. Press for Security and enter the Lock Code.
3. Press for Reset Phone. A confirmation displays
explaining that you will erase your phonebook.
4. Press to reset the phone, or press to cancel
the operation.
5. To confirm resetting the phone, press again. The
phone reboots (turns itself off then on), restores the
default settings, erases your messages, and then returns
to Standby mode. To cancel the operation before
resetting the phone, press .