Nokia revealed its first smartphones - Lumia 920 and Lumia 820 - which run Microsoft's Windows Phone 8 OS, a big step for a company that has bet its future on an alliance with Microsoft. Here is everything you need to know about Nokia Lumia 820. The device is a cheaper, mid-range phone and doesn't have the special camera lenses, but it sports exchangeable backs so you can switch colours. Watch this video to get the first look at the new Nokia Lumia 820.
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