If you are trying to get a white or cyan Nokia Lumia 900, you aren't alone. Due to high popularity of the phone, AT&T has been out of stock for a while now. However, the white and black models are now back in stock and ready to ship. The cyan model will force you to wait a week for it to ship, though. It seems as though Nokia has managed to speed up production to meet demand.
Other retailers are also showing that Nokia has ramped up production, however, the white model is still hard to get. Best Buy has the black and cyan models shipping in two to five days with no mention of the white model. Amazon is offering the black and cyan models with an estimated ship time of 24 hours, but an 8 day delay for the white model.
Certain countries haven't taken to the Nokia Lumia 900 so well. However, in the United States, the device is popular, even with AT&T being the only carrier with it. A Nokia rep stated last month that US consumer reaction has been "positive across the channel -- including direct stores and national retail."