Without anything of an explanation as to why, it looks like AT&T has sold out several colors of the Nokia Lumia 920 smartphone. The handset is available in black, cyan, white, red and yellow and in this case, the carrier has sold out of the black and cyan colors. Both colors are currently sporting an out-of-stock message as opposed to the add to cart message found on the remaining colors. That said, we do have to wonder whether these are selling really well or if AT&T had limited inventory on these colors. Regardless of the reason though, if you were hoping to pick up a black or cyan Lumia 920, it looks like you may have to wait.
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