Samsung SCH-850 - Manual (Page 91)

To set this feature:
1. Press to display the Main Menu.
2. Press for Security and enter the Lock Code.
3. Press for Hide My #.
4. Use the scroll keys to select ON or OFF.
5. Press to save your setting.
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Resetting the phone erases all of your saved options and
returns them to the factory default settings. Resetting the
phone also erases your Phone Book, Call Logs, and SMS
messages.
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 screen
displays.
4. Press to reset the phone, or press to cancel
the operation.
5. The phone reboots (turns itself off then on), restores the
default settings, and then returns to Standby mode.