I have FULL 5 bar 3G reception in my apartment on the 5th floor in San Diego. My apartment is all windows, so of course the signal comes right through. However, my phone lost it's signal today. It said "Searching..." Normally when it does this, it will revert to EDGE, which also has a full 5 bar reception, but this time it didn't. I waited. I switched to airplane mode and then back to normal... No dice. So, I shut the iPhone off, and back on, and the signal came right back. I also notice at night when I'm sleeping, sometimes it looses the 3G and switches to EDGE. What's going on? Is this phone having issues holding a signal? I haven't had a single dropped call yet (except in the elevator).... But it seems like when I'm not using the phone, is when it likes to loose signal or revert to EDGE.... What gives? Apple problem or AT&T?