Phone Sign-In, is a windows phone app which allows Windows Phone users to log-in into their Windows devices without entering the user name and password. Currently the app is in beta stage and available on Windows Phone store. According to Microsoft The first step towards a world without passwords! After a quick Bluetooth sync, use this app to unlock your Windows 10 computer at work. Just open the app and tap on a nearby computer.
This app is still in beta. Future versions will include support for Microsoft account, a sign-in solution for browsers and VPN, one-time passcode generation, and MFA approval through notifications.