Don't know if this is isolated so I thought I'd ask. Activated the iPhone 4 yesterday after upgrading from a 3G. I have always had the phone on auto brightness. What I've noticed with this one is that in low light settings the phone stays really dark, almost as if it were on dim. If I turn on a light or turn the auto brightness off then it lights up. I've never had this problem with the previous model, anyone else?