Here is a copy/paste from another thread I just posted on.
For me, the simplest solution was being able to turn 3G on and off. There is a spot on my way to school each day that without fail, will drop calls. As long as I had 3G off, I was golden. Since the toggle is no longer there with the 4s, I had many, many dropped calls. After awhile, I just didn't bother calling knowing the call would be dropped. Calls were also garbled and people couldn't understand me.
I could no longer make or receive phone calls in buildings at school or in a school's elevator like I previously could as long as I had 3G off.
Yes, one time all data stopped and I had to do a hard reset as others have experienced.
So the deal breaker for me was no longer having the 3G toggle. I don't care if it's hardware, software or the carrier. I could make and receive phone calls successfully when 3G was turned off. I returned my 4s and I'm back on my 4.
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