I had the same problem as many here. Hold the iPhone 4 in left hand and boom, dropped to 2 bars. Been going on since the launch day. However, I did "Reset Network Settings" and the issue seems to have reduced quite a bit. For instance, it stays at 3 bars now and not at 2. At times it just drops only 1 bar and stays at 4 bars. Anyone else who could see an improvement by trying this? Atleast a temporary fix I guess.