Predict ANY playing card at ANY time

Ask a friend to name a card and show that the last photo in your phone's camera roll is a photo of their named card.

Here's why this is so cool.
-It works anytime and anywhere.
-The method takes seconds to learn.
-It's a real photo of a real playing card.
-Spectators can see that there is only one card in your camera roll.
-Works with any card name there are no forces.
-No sleight of hand ability needed.

Predict the future one card at a time.