How to Perform the cell phone mentalism card trick

This video teaches us how to perform a magic trick with a deck of cards and a cell phone. The presenter starts by talking about a man named Eddie Carrol, who apparently hates the presenter for revealing these card tricks on YouTube. The presenter leaves his cell phone and a deck of cards and leaves the room. A spectator is chosen to pick one card out of the deck. When the card has been picked the magician's assistant calls the magician and says that the card has been picked. The trick is how the magician and magician assistant communicate on the phone to tell the magician which card the spectator picked.