I am wondering about my upcoming ATT Premier order for an iphone. I plan on ordering it on a new line, then going to ATT and switching sims to my primary line. Now I wonder if when I go into an Apple store in case my phone has any issues, will it matter what line its on or where I bought it from? I have never owned an iPhone so I dont know how the apple store actually works. From what I rememeber, I bought a used iPod Touch a long time ago, and it had issues and I just brought it in and got an exchange. Will it be the same with the iPhone?