Microsoft is just around the corner from unveiling a brand new build of Windows 10, which will include a number of new features and changes. Along with the unveiling of these new features, Microsoft is also rumored to be planning to unveil Windows Phone 10 too, which may ultimately be called Windows Mobile 10.
Today, a new app titled Phone Insider appeared in the Windows Phone Store, which "provides registered Windows Insiders the ability to receive pre-release OS updates on their phone, directly from Microsoft." Right now, normal insiders are unable to sign into the app, as it's currently only available for internal Microsoft employees.
Nawzil on Twitter claims the app will be updated soon which will enable normal Windows Insiders to sign in, allowing them to receive pre-release OS updates. It looks like this app will eventually enable your phone to update to Windows Mobile 10, which is definitely exciting.