Microsoft’s SmartGlass app is now available for iOS devices.
SmartGlass lets Xbox 360 users interact with synced game content on their phone or tablet while they play a game—for example, as in a separate map view in Forza Horizon
https://lastchance.cc/the-xbox-360-s-first-major-second-screen-game-is-live-5957524%3C/a%3E%3C/p%3E
The app has been available on Android devices since last week.
https://gizmodo.com/smartglass-for-android-is-here-only-for-those-running-5955364
Xbox SmartGlass [iTunes, free]