About the lock::::::::::::
You can set one of the convenience key to lock the phone.
The lock shortcut * has now been changed to activate standby mode. i think i like it this way
OR
Set a password on the device and have it to lock within a minute [or your preference] of non-use.
Options>>>>>Screen/Keyboard>>>>Right/Left Convenience Key Open.....
Then Scroll through the list. Mine has a Lock option, Mine you i also have password enabled.