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This is a great phone it runs on windows 7. Has an amazing display and for someone who was all out android i love this phone it doesn`t have quite as big of an app market yet as apple or android but the features of the phone and its productivity make up for what it lacks. I`ve found its also a great phone if you tend to drop yours a lot or break them its almost i wont say all the way but almost indestructible mine has had some accidents and as you can see it still looks brand new. I really recommend this phone
I thought id add some of what http://amazon.com has listed as the phones features below, for a more clear description of the interworkings of the device.
(The Nokia Lumia 900 4G LTE phone features a large and vibrant 4.3-inch AMOLED ClearBlack Display. The AMOLED (active-matrix organic light-emitting diode) technology increases the refresh rate of the screen and enhances the contrast ratio while reducing energy consumption to increase battery life. The ClearBlack Display (CBD) feature blocks incoming light reflections through a polarized layer to improve screen visibility under direct sunlight. This smartphone does not shy away from technology to enrich the user experience.)