I guess my blog post title says it all. The poor reception on the iPhone 4 is real and I guess it is going to stay unless you buy a cover to prevent your palm, finger to ground the antenna and hence lost the reception (my opinion).
I think that Apple already know the problem. That is why they introduced Bumper sleeve during the keynotes. Normally, Apple would let companies produce their own version of sleeves or covers for iPhone.
You know what? I think Bumper would sell out fast. For Apple fans, the solution is already out there. Use the Bumper or a casing for your new iPhone 4 or avoid holding (grounding) the antenna. Period.
Click Here to See iPhone 4 Bumper
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(source)