Casio EXILIM C721 - Manual (Page 166)

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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].
4. Press 5 Restore Phone.
5. After reading the warning message that appears, press the
Directional Key j up or down to select Yes, and then press
the Center Select Key [OK].
6. After reading the message that appears, press the Center
Select Key [OK].
7. Enter the four-digit Lock Code, then press the Center Select
Key [OK]. The phone will turn off and then back on again
automatically.
System Select
You can set your phone to search or roam for another network
when you are not in your home area.
Leave this setting as default unless you want to alter the system
selection as instructed by your service provider.
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, 7 System Select.
3. Press the Directional Key j up or down to select one of the
following settings, then press the Center Select Key [OK].
Home Only Only within your home area or home affiliated
area.
Automatic Scan radio channels based on the Automatic
setting.