AT&T just kicked things up another notch, going from a launch day pre-order sellout for the iPhone 4 to well, a total pre-order sellout. The carrier has announced this morning that it's "suspending pre-ordering today in order to fulfill the orders we've already received," saying only that it will resume the pre-order process when it can wrap its brain around the "additional inventory" it'll have on hand. It's hard to gauge where this lies on the truth / hype meter, but for what it's worth, they're saying that pre-orders outstripped the 3GS
