Windows Phone's first version named Windows Phone 7 was released in October 2010. Then in 2012, Windows Phone 8 was released. Windows Phone 7 using Windows CE-based kernel. While Windows Phone 8 used Windows NT. Windows Phone 8 was using Windows 8 PC versions. Windows Phone 7 was built using old OS which was differently coded than Windows Phone 8. Most of the apps of Windows Phone 7 [...]