Samsung SCH-3550 - Manual (Page 75)

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Resetting the phone erases all Phone Book entries, 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
.