Before the usual applications in use is the Windows insider, with a choice of options in the form of Ring: Fast an Slow.
Simultaneously with the announcement of Microsoft, about some of the windows phone device (Win phone 8.1) that can be upgraded into a Win phone 10. .... In other applications that can make use to upgrade Windows phone.
Name the application " Advisor upgrade ", which is only in use by Windows phone devices with OS WP 8. 1. .... as an application developer WP 8.1 Windows phone. This application, you can get on Windows phone store.