Originally Posted by skunkd
Yea but not everyone has unlimited data plans anymore. Plus your phone has to be connected to the same network to use airplay. So that doesn't work with Cell phone hotspot unless you hook up a wireless router inside your car somewhere.
If you don't have enough data, it's not a good option for you!
I'm not using Airplay and haven't tested it, I'm simply downloading and watching the movie directly on the AppleTV using my iPhone as a hotspot - that works fine, but you do need sufficient data, obviously.
I'm going to guess that Airplay won't work for the same reason the AppleRemote can't be used and the reason skunkd points out - they need a common WiFi network. BUT I haven't tried yet.