Nokia debuted its Lumia 900 Windows-based smartphone on Sunday, but buying one in person from AT&T -- the phone's official reseller -- turned out to be an exercise in futility given that the device hit the market on Easter. Most AT&T stores in New York reportedly were closed for the holiday, but that didn't stop the Lumia 900 from racking up big sales on Amazon, where black and blue models of the device took the online retailer's top two spots on the cellphone-best-seller list.

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