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Windows Phone app from Microsoft called Phone Insider has been discovered today. The app could possibly signal that the company is preparing to launch its rumored preview version of
Windows 10 for smartphones.
The short description of the app simply says:
"The Phone Insider application provides registered Windows Insiders the ability to receive pre-release OS updates on their phone, directly from Microsoft. For more information about registering and becoming a Windows Insider visit
http://insider.windows.com."
Unfortunately, at the moment, there's no way to sign into the app, which would suggest that it's not ready for the public to fully check out.