I made a small video where I show off me holding for 40 secs the iPhone 4 without loosing signal. I drop 1 bar because of my apt complex being concrete, which is within normal as my old 3GS did that to.
Link: Click Me
Edit - Yes I realize my English is not great. At the end I am supposed to say 4 bars but it sounds like full.
Link: Click Me
Edit - Yes I realize my English is not great. At the end I am supposed to say 4 bars but it sounds like full.