For those of you who have gotten the iPhone 4S, (coming from a 3GS), have you noticed that your phone uses more data? I'm on a limited data plan, so I have to watch how much I use. It just seems that mine uses more data. When I was on my 3GS, I had it on EGDGE network so it would have a more consistent signal. Since the 4S doesn't allow you to turn off 3G, does the 3G network use more data just because its faster?