The phone as it comes from the box, locks automatically when the screen backlight goes out. This is a stupid feature because you can't turn it on or off. You can keep the backlight on forever and the phone won't lock if you set the Screen Backlight Timer to never turn off, but then your battery drains. All I want to happen is the phone DOES NOT LOCK when the screen times out. The ONLY time I want it to lock is when I MANUALLY lock it using the end call button. The reason the default feature is stupid, if you are texting back and forth with someone, and they text you ever 30 seconds, you will have to unlock your phone every damn time to answer them, which is stupid. If the phone is just sitting on your desk you should be able to pick it up and answer right away. If it is in your pocket you should be smart enough to lock your phone you shouldn't need the G1 to lock for you every time the screen goes black.