Both Apple and AT&T have outlined their plans for June 19, when the iPhone 3G S goes on sale. Apple will open its retail stores worldwide at 8 a.m. local time to begin sales of the phone and to allow those who pre-ordered to come in and pick their units up, while AT&T plans to have two queues outside its stores—one for those who pre-ordered, and one for those planning to purchase their unit that day. The pre-order customers will be allowed…