No, but I might be willing to pull your finger...
Less that one half of one percent of iPhone 4 AppleCare calls were about this issue. Apparently 99.95% of iPhone 4 owners didn't experience this issue, yet Apple still worked to resolve it. Even though it was such a small amount it was still a good chunk of phones because 3 million iPhone 4's were sold. No product is perfect 100% of the time in every possible situation. Other phones like the Samsung Omnia 2 and the BlackBerry Bold had the same exact issue, and yet no one is squawking about them. Maybe it's because 3 million of those phones weren't sold. In any event it’s a non-issue with the current product because Apple has redesigned the entire antenna in the iPhone 4S so that the cellular radio in the phone can choose between two antennas, depending on which is sending or receiving the signal best.
actually it was on all iphone 4 ... each ip4, when held "incorrectly" aka..naturally by any "normal" human, the signal would drop 1 or 1.5 bars.
so if your signal was more than 3 bars, then it would still retain a signal with 1 bar left. but if you are on the fringe of service, .... boom you dropped a call. there are many many many reviewers and vids that prove this. from non-biased demos.
solution:
1. you should hold it differently.. dont hold it like in a natural way.. do it the JOBS way!
2. here is a rubberband to cover the great metal material that we put in to show off design and beauty.. that should fix the "non-issue"