Nokia’s Windows Phone Flagship Nokia Lumia 800 with Nokia Lumia 710 launched at Nokia World 2011. Few earlier to this big launch event, two cutting edge popular smartphones Apple iPhone 4S and Samsung Galaxy Nexus announced. The similarity or notable highlight to all these smartphone launch was the mobile operating system that comes with the devices. Nokia Lumia 800 – Windows Phone 7.5 OS Apple iPhone 4S –...