The Xbox Game Pass app which Microsoft started beta testing for iPhone and Android devices back in August is now available to download for everyone, at least on the App Store.
The app is currently only available to download for iPhone users on the App Store. Support for iPad devices is yet to come.
Using the Xbox Game Pass, users can search and look for games that are free to download with the Xbox Game Pass. The app also lets users download a game onto their Xbox directly from the app itself.
You can download the Xbox Game Pass app for free from the App Store.
App Store Link