|Lock the keyboard|
In the home screen, select Menu, and quickly press the right selection key.
|Set the keyboard to lock automatically after a defined length of time|
Select Menu > Ctrl. panel > Settings and General > Security > Phone and SIM card > Keypad autolock period > User defined, and select the desired length of time.
|Unlock the keyboard|
Select Unlock > OK.
When the device or keypad is locked, calls may be possible to the official emergency number programmed into your device.