So I'm in the US and I got a factory unlocked iPhone 3GS. How do I go about activating it in iTunes? Would the AT&T stuff still come up or would it go differently since the phone is already unlocked by Apple? Also I'm using T-mobile, so would I have to put in my sim card while I activate the phone or do I just activate the phone simcard-less? Any help would be appreciated. Sorry if this is posted in the wrong part of the iPhone forum.