I have an iPhone 4S and the battery acts really weird. I can return it to Apple and they can give me a new one. It feels like a waste to use it when I'm getting the new one soon. I think the september 12th rumors are almost confirmed, right? I can unlock from AT&T and sell the new one that they give me and buy a cheap 3GS to hold me over for a little over a month. Keep in mind, I never had anything before an iPhone 4. Is this a good or bad decision?