I recently upgraded to a 3G S from the previous 3G model hoping it would be faster and battery charge longer. Unfortunately I do not see a difference. Actually the battery charge does not last as long as my previous 3 G iPhone and the web browser has the exact speed. I am also concerned that the screen sometimes dims and does not bright when I tap it. I have to attempt several times before it can brighten up again. I did not have these problems before with my regular 3 G. I purchased the phone about 25 days ago, at a ATT retail store. Is it reasonable to do an exchange for another iPhone or these problem are normal with the 3G S? I did troubleshoot with Apple Customer Service and they felt the phone was okay. But I think I still got a bad batch. Everything that I read about the 3G S is that it has better battery charge and much faster than the 3G.