Apple's made a few changes since the launch of their last iPhone, the iPhone 3G. While the the 3G wasn't available for online ordering until the day it was released, the 3GS is open for pre-orders right now. A trip to the online Apple store should be all you need to do. If you're having trouble, Apple's put up a helpful video to walk you through it.
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They've changed more than just their pre-order policy. In order to combat the massive lines that are endemic of iPhone releases, Apple is having customers queue up in two lines. One of those lines will be for pre-order customers, who will be allowed to enter the store at 7:00 A.M. The other line will be for normal customers, who will enter at business hours.
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When the store opens both lines will merge, although precedence will be given to the pre-order line. The only guaranteed way to get an iPhone 3GS is to pre-order. So, if you want to be treated like a king on June 19 and stand in a fancy line, pre-order your new iPhone now.