Kol Mafia IPhone App.

Does it exist? No. Should it exist? God yes. Is it possible? Probably not. But I suppose it would be nice to have confirmation on that last bit. ._.

There is no Java support on the iPhone, so it would be somewhere between difficult and impossible.

Google is my friend. A bit of googling tells me that it is possible, although not simple:
http://eclipsesource.com/blogs/2010/06/11/writing-ipadiphoneipod-applications-with-swt/

Also it is not impossible to install java on an iPhone, though it does take a bit of work:
http://iphoneroot.com/tutorial-install-java-on-the-iphone/

It's a shame that Jobs is set against allowing Sun to provide java for the iPhone.

If mafia were to be ported over to a mobile platform, I'd guess android would be first. At least the code is written in java, even though it doesn't use the usual J2SE or J2EE playforms