Instead of waiting another three weeks for my pre-order to arrive I noticed a Sprint version of the 128 GB 7+ was available at my local apple store so I reserved it. I'm buying outright. As I understand from reading on Apple's site and other threads here I can use this on my AT&T plan. I should just bring it in to AT&T and have it put on my account, swapping out the SIM card? Does this sound correct? Anything else I need to do?