I've seen a lot of people posting that they can MAKE the bars drop, but it hasn't been a flood of people actually stating they have serious call/data dropping issues (there are some, but not nearly as many as can simply make the bars drop by purposely shorting the antenna)...if this call dropping issue was HALF as widespread as some people would like you to believe it is, there would be lines for miles outside every Apple and AT&T store with people retuning the phones...

There are nearly 2,000,000 iPhone 4's in the market already...it's pretty safe to say that MOST people aren't returning the phones...