My understanding is the N3 screen is supposed to automatically come on when I have an incoming phone call, and it seems to do that most of the time. But sometimes (I haven't really figured out how often, or under what circumstances) the phone rings, and the screen stays black. I can always manually turn the screen on and answer the phone in the normal way --- but it's not supposed to be that way, is it? So anybody have any ideas? Just for info, I've eliminated the lock screen on my phone, and it goes directly to the home screen when my screen comes on.