Recently bought a 2nd hand Pre 2. Love it.
I can't get Secure Lock to do anything. I can set a PIN or a passcode as per the instruction book, but when I 'Drag To Unlock' the phone just opens, never asking for a code or PIN.
Sometimes the wallpaper changes to a blue sky & clouds image for just an instant, but then the phone opens. Not sure if that's the start of the PIN entry screen and then it changes its mind (as I've never sen it actually work!)