Well, you can jailbreak the iphone and install a copy of Joiplay. Not sure that is a good idea though as it can get you in a boatload of trouble with the icompany. And results with Joiplay for HI are not good if you view the posts about it in this thread.
(***disclaimer***) ( This is FAN FICTION / FAN EDITED and no way represents any actual story from the game ) (Any similarity to any future story-line is coincidental)