This past weekend we noticed that the Lumia 900 had gone out of stock with AT&T. And well, at the time we weren’t entirely sure if AT&T was holding some units back while they waited for the software update to roll-out or if the handset was truly sold-out. Needless to say, we have not gotten any official answer either way but we can say that it appears to have just been out of stock. That is based on the fact that the handset has come back available — but only in one color. At the present time, the Matte Black version of the Lumia 900 is showing as available while the Cyan version is still sporting the out of stock message. Lastly, aside from the handset being back in stock (for Matte Black), everything else appears to be the same — including the price.