Your can be protected by PIN numbers at two levels: the SIM card level and the phone device level. To change either of the locks you must know the PIN.
Use and
to select the type of lock (SIM or Phone).
Your can be protected by a PIN number that prevents unauthorized access to the user interface.
Check Enable protection to activate or uncheck to deactivate the protection and enter PIN code when prompted.
Press Change PIN button to change PIN.
The device can be set to lock automatically by the Homescreen settings application.