If you are looking to pick up an iPhone 3GS from an AT&T Store tomorrow morning, you’ll want to check out the video above to details on how everything is going to flow tomorrow morning. Basically, stores open at 7:00 AM, and you’ll be able to enter first if you have a pre-ordered phone waiting for you. As soon as the pre-order line is done, you can enter to purchase an iPhone 3GS if you did not pre-order. That second line is good for both current and new AT&T customers, but if you are new, you should head to the AT&T iPhone page first so you can get through the process a bit quicker, since you’ll be pre-qualified.