Oh by the way I got answers from GI.
About the fact that iphone players have no way to get green cash (no video nor code): Developers are working on the game and my opinion is very valued... To sum up they don't care, but have to answer something.
About the fact that some neighbors can't visit my game, apparently the problem doesn't come from my game, but from yours. So they told me that it's you who should contact GI if you want the problem to be solved not me. I'm not sure the problem would be solved if you tried that, but apparently my game has no problem. I'm not really convinced, but that's all I can do for you, sorry guys.