Microsoft has stated that you will not be able to uninstall the Your Phone App from Windows 10 as it is now tightly integrated into the operating system. The Your Phone app is being developed by Microsoft to allow you to easily access content on your mobile device from the Windows 10 desktop. Most of the features so far are for Android users, such as screen mirroring, transferring photos, the ability to reply to Android SMS texts, and the viewing of Android notifications. For iPhone users, the features are more limited as at this time the only thing you can do is continue reading web pages opened on Microsoft Edge for iOS on Windows 10.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-says-windows-10-your-phone-app-cant-be-uninstalled/