Official rolling out of windows phone 7.8 has been made and nokia lumia 800 is the first windows phone to get the update along with other lumia range. The update can be downloaded from the Zune desktop software in four different steps. The update will automatically transform into a new boot screen, resizable tiles on the main screen and addition of Xbox tile.
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http://www.mobilefun.pk/mobile-phone-news/official-rolling-out-of-windows-phone-7-8-for-nokia-lumia-800_68.html (http://www.mobilefun.pk/mobile-phone-news/official-rolling-out-of-windows-phone-7-8-for-nokia-lumia-800_68.html)