Microsoft has taken wraps off the Surface Duo, a Surface device that offers telephony capabilities. The Surface Duo runs on a custom version of Android built in partnership with Google and will feature support for apps from the Google Play Store, which can scale across dual screens for enhanced productivity.
https://www.notebookcheck.net/The-mythical-Surface-phone-just-got-real-Microsoft-shows-off-the-dual-screen-Surface-Duo-smartphone-running-a-custom-Android-build.436785.0.html