Interesting. I grew up in Dickinson. I have visited that area many times, and have never seen bad signal strengths. Maybe something in the building was shielding your phone.
It is interesting to hear how people with battery problems seem to have set up their 4S much differently from mine. I got a NEW SIM, even though I was changing from an iPhone 4 in use less than a month. AT&T store said it wouldn't work well if I used the old SIM. Maybe they need to tell OTHER places. Then I went home and put the phone on iTunes as a 'new phone', then synced it.
BTW, I don't think Siri will EVER be 100%. Try telling it to add Hersey bars to your shopping list. The results are somewhat interesting. I also notice that it doesn't work well in my car, or with the TV going.
I really like the phone, and have very few complaints with it. I am still looking for a 'perfect' case though.
Now, would SOMEONE out there go to AT&T or Verizon, etc., and get a NEW SIM, and see if that helps the battery problem for them. They will need to reset the phone completely, and then put in the new SIM, and then add it to iTunes as a new phone, and sync their data back, NOT restore.
Wouldn't it be fun to solve this problem before Apple?