I still don't understand why people are complaining over something that doesn't exist. I don't have any problems with reception in my area as well as San Francisco. I was there today and I had no reception issues for voice or data. My bars hovered around 3-5 but my speed was very consistent. No dropped calls either. Furthermore, these signal issues are only proven to exist in low reception areas. This basically means, if you have low reception to begin with, you will still have low reception. And that is basically saying 1+2=3 and 2+1=3. No difference at all. You can argue bars may be misrepresented but I still got consistent speeds on SpeedTest. Stop whining about some phenomenon that only happens to a select few. None of my friends from other areas have reception issues with their iPhone 4s.
So why does my 2007 iphone have reception and no drop calls in the exact same location my iPhone 4 does? Low reception areas is not the issue. It's a damn hardware design flaw. Your skin might not be as conductive as others. Simple as that.