This is this killer app that may just force me to buy an iPhone:
Yes, it's an ocarina.
In order to play your Ocarina, you will need to blow into the microphone (you will see a small gold arrow where to blow). The mic is sensitive, so try not to blow very hard (if you are puffing your cheeks, you are blowing too hard).Let me repeat; it's an ocarina...
Rest the iPhone on your ring fingers and thumbs with the headphone jack facing away from you. Use your index and middle fingers to cover the four holes.
To play the highest note, you will need uncover all four holes, but don't drop the iPhone! It may take some time to learn how to balance it, so be patient and remember to play over a cushioned surface.