Samsung SWC-R640LBAXAR - Manual (Page 170)

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3. Tap Lock Phone Now. “Phone locked” pops-up in the display.
You are returned to the Home screen, which is now in Phone
Lock mode.
Note: To unlock, select Unlock in Standby mode and enter the lock code.
Reset Settings
Reset Settings returns all Settings options to their factory default.
1. In Standby mode, tap Menu ➔ Settings ➔ Phone settings ➔
Security.
2. Enter your four-digit security code.
3. Tap Reset Settings. You are prompted to confirm that you wish
to reset your phone’s Settings to default values (except for your
Contacts list and Voice Dial).
4. Tap Yes to reset your Settings to default values.
Important!: Resetting does not delete user data.
– or –
Tap No to maintain your current Settings and return to the
Security sub-menu.