If you haven't updated the Apple TV yet, it now supports the remote app. No Siri, but your phone essentially becomes the top part of the Siri remote!
You'll need to pair it by going to Settings -> Remotes and Devices -> Remote app
Then follow the on screen instructions.
Anyone else update?
You'll need to pair it by going to Settings -> Remotes and Devices -> Remote app
Then follow the on screen instructions.
Anyone else update?