Have somebody pick a number between 1
and 60 that must not be told to anyone else! Present the six
cards on the iPhone one after the other, and ask whether the secret
number is on this particular card. Answer yes if the number is on
this card, no otherwise and continue with the next card. When
it comes to the last card make a magic move with your hand over the
iPhone....and finally the secret number appears on the
iPhone.