Maybe it's been discussed before, but I just got an 8 GB iPhone and I really love this thing. When I activated it and turned it on I had 4-5 bars all through my house the whole night. I woke up and I had (and still have) the "No Signal" at the top left. What could be the reason for the quick change in service? Is this something that can be fixed in software updates? Oh yeah, I noticed when I had a good signal bars would rise and fall a lot. I hope this gets fixed...