Hi. I bought Modern Combat 3 Fallen Nation for my iPhone 4 and for my brothers Android Samsung Galaxy Vibrant and we're trying to play multiplayer, but we can't. It seems like we have two different versions of the game. When he sends me an invite to a game, it tells me "Player wants to play Modern Combat 3 - Update 1 HD+ Android with you" and I can't play because it says it's the HD version and there is no HD version for the iPhone or even iPad that I see. What can I do to get this to work?