AT&T has sold out its initial quantities of iPhone 3G S pre-order supplies, but the company is still accepting pre-orders that will reach customer hands in "about a week," according to a company spokesperson.

Amid conflicting reports that the company has sold out of its pre-orders, AT&T told iPodObserver.com that pre-orders taken after June 13th, 2009, will arrive "about a week" after the device goes on sale June 19th. Pre-orders taken before the 13th will be available for customers on June 19th.

What is not clear is whether or not AT&T will have supplies on hand in its retail stores for customers trying to buy one without having pre-ordered them. The AT&T spokesperson with whom we spoke said simply, "I can't predict how quickly supplies will last in stores this Friday."

In the meanwhile, Apple has begun shipping its own pre-orders for the device. AppleInsider reported earlier on Monday that customers who pre-ordered the device from the Apple Store began receiving shipping notifications. Those devices are expected to arrive at the customer's location on June 19th.

When the iPhone 3G was released in June of 2008, supplies were constrained for several weeks after its launch, with Apple Stores seeing daily lines to buy the device and limited, daily allotments quickly selling out. In addition, Apple typically had more of the devices in its own retail stores than AT&T.