Casio EXILIM C721 - Manual (Page 165)

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SETTINGS & TOOLS
1. From the idle screen, press the Center Select Key [MENU],
then use the Directional Key a to select Settings & Tools
and press the Center Select Key [OK].
2. Press 6 Phone Settings, 6 Security.
3. Enter the four-digit Lock Code, then press the Center Select
Key [OK]. The default Lock Code is the last 4 digits of your
mobile telephone number.
4. Press 3 Phone Lock Setting.
5. Press the Directional Key j up or down to select one of the
following settings, then press the Center Select Key [OK].
Unlocked Phone is unlocked.
On Power Up Phone will lock when it is turned on.
k Lock Phone Now
1. From the idle screen, press the Center Select Key [MENU],
then use the Directional Key a to select Settings & Tools
and press the Center Select Key [OK].
2. Press 6 Phone Settings, 6 Security.
3. Enter the four-digit Lock Code, then press the Center Select
Key [OK]. The default Lock Code is the last 4 digits of your
mobile telephone number.
4. Press 4 Lock Phone Now.
NOTE
To unlock the phone, press the Right Soft Key [Unlock] from
the idle screen, enter the four-digit Lock Code and then press
the Center Select Key [OK].
k Restore Phone
To delete all User Data and restore all settings to their initial
defaults: