To get involved with the new companion app, you'll need to own FIFA 17 on your Xbox 360, Xbox One, PlayStation 3, PlayStation 4 or PC. From there, you can keep right on top of your FIFA Ultimate Team, building and managing your squad and those all-important transfers.
The app supports devices running Android 4.1 and up, iDevices on iOS 8.2 and higher, or Windows -- yes, Windows devices running Windows Phone 8.1 or newer. While it's free to download, there are a bunch of in-app purchases for items like FIFA Coins which can become quite a slippery slope for the dedicated FIFA devotee.
If you own FIFA 17, the companion app is basically a necessity, so be sure to snap it up via the links provided below.