Hello. I am an iPhone user in the US. I bought the new 4S yesterday and moved my phone number over to it, all my apps, songs, etc. But when I got to work today (where I spend most of my time), I have a very difficult time sending iMessages, downloading data, using the internet, checking email. I never had these problems with my old 3GS. So this upgrade is essentially useless to me. I am going to return the 4S to the Apple Store and then go back to using my 3GS. How do I go about going backward and re-activating my old phone? Or should I just go to the Apple Store, and return the 4S and have them start up my 3GS again? What's the best course of action. I don't want to lose my number and I don't want to screw with any of the contract stuff. I spoke to AT&T and they said if I return the phone, I can revert back to my old contract with them which expires in 2 months. Thanks in advance.