Archived:Detecting keypad lock/unlock events not possible on S60 3rd Edition (Known Issue)
It is not possible get notification events for locking or unlocking the keypad on S60 3rd Edition devices.
S60 SDKs include the Keylock API (RAknKeylock class) which provides a method for programmatically locking and unlocking the device keypad. However, this API does not have an observer interface for the keypad lock status - it is not possible to receive events when the user locks or unlocks the keypad.
No solution available.