2Predictions is a magic card trick with your iPhone.
The magician shows that he no longer uses traditional card deck but now digital cards integrated in his Iphone.
After explaining how to use this new type of cards, the magician asks a spectator his favorite number (eg "13") and he gives him his iPhone.
Back to the audience, looking neither the spectator nor the iPhone, the magician predicts the card that the spectator turn face up (eg "2 of Spades") and also predicts that the card previously signed by the spectator, also freely chosen, is the 13th (for our example) before the "2 of Spades." (for our example).
Note : This magic trick requires a little practice and is not intended for beginners.