Upcoming Windows Phone 8.1 is already tested and the tested report published on benchmarking site WPBench, the handset has the build number 8.10.14130 for Windows Phone 8.1. The operating system build for the GDR3 variant of Windows Phone 8.1 is 8.0.10532 and the developer preview version of Windows Phone 8.1 is 8.10.12397. According to the update scheduled the handset will take the official place somewhere in August; Native folders option added in the handset as a new feature. According to the report the update is available for the developers who are registered with Microsoft as a Windows Phone developer or for those who buy the Nokia Lumia 630 or Nokia Lumia 635. The fervently anticipated Windows Phone 8.1 update comes pre-installed on those two models.