This past week I was spending time with my brother in Newnan, Ga and AT&T's coverage is rather poor near his house. 1 - 2 bars on edge. Still, for the life of me I cannot get my phone to loose signal via the death grip. I was under the impression that all iPhone 4's suffer this flaw but I and many cannot reproduce the loss of signal. This recent test was done without a case, of course, and in an area with poor signal. This has been the case for me since the 24th, week 25 phone. My point in posting this is that are factors involved that we do not understand. This is far from a denial of the issue but I think it is clear it is not universal.