I find it humorous that people still believe week # has an effect on how their iPhone operates. Completely disregarding the fact that they haven't the time to change Chinese production lines with current demand, Apple themselves have admitted they won't change the design - changing it after announcing that would just make the whole situation unimaginably worse. A PR catastrophe you might say.
No matter who repeats what I've said, the placebo effect will continue to convince new customers. Strong signal strength areas do not suffer death grip issues. The strong signal strength in London, for me, prevents any signal loss due to death grip. Elsewhere, it's another story.
Since I have no issues in my home area, according to these 'perfect iPhone 4' owners, my iPhone 4 has 'NO problems'. Be honest with yourself and stop jumping to useless, unproven conclusions.
You either experience death-grip symptoms in your area, or you don't. The handsets are identical. Accept this design flaw, or return the handset. I'm certainly keeping mine but accepting that it does have a fairly significant flaw to it. Fortunately for me, my day-to-day usage of it is not in any way affected by the flaw.