Samsung SCH-A670ZSUXAR - Manual (Page 182)

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Section 13
2. Enter the four-digit lock code using the keypad.
Note: The default lock code is the last four digits of your mobile phone
number.
The Lock prompt disappears and the Security menu
appears in the display.
3. Press for Voice Privacy. The following options
appear in the display:
ⅷ Standard—Voice privacy is disabled.
ⅷ
Enhanced—Voice privacy is enabled.
4. Use the navigation keys to highlight the Voice Privacy
option of your choice, then press .
Restriction
Restriction allows you to restrict outgoing calls,
incoming calls, and all access to your Contacts.
1. In standby mode, press the Menu (left) soft key ( ),
then press (for Setup) and for Security.
The Lock prompt appears in the display.
2. Enter the four-digit lock code using the keypad.
Note: The default lock code is the last four digits of your mobile phone
number.
The Lock prompt disappears and the Security menu
appears in the display.