PIN and PUK
The personal identification number (PIN) protects your SIM card from unauthorized use. The PIN unblocking key (PUK) can unlock the blocked PIN. Both the PIN and the PUK are provided with the SIM card. For details, contact your service provider.
If you enter wrong PINs for a specified number of times consecutively, the phone displays a prompt asking you to enter the PUK.
If you enter wrong PUKs for a specified number of times consecutively, the SIM card becomes invalid permanently. In this case, you need to contact your service provider for a new SIM card.
Locking the Screen and the Keypad
In standby mode, press 
and then tap 
to lock the keypad
and screen. To activate the screen and unlock the keypad, press 
and then touch the screen according to the prompt that is displayed.
If the Auto keypad lock function is enabled and if the phone is in standby mode for a preset period, the keypad is locked automatically.
Applications
zCalculator: to perform simple calculations.
zCalendar: to view dates and set events.
zTask: to view and set tasks.
zWorld clock: to view and set the world clock.
zAlarm: to set alarms.
zJava: to download and install java applications and games.
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