Ask a spectator to name out a card and instantly reveal that card with the photo on your phone.

This isn't just limited to cards, there are many predictions that can be performed using this method.

100% Impromptu

No forces
No voice recognition
Use your own photo's
Not only for cards, you can predict anything you can think of
Fake icon and title (Yellow folder called "Documents")
Practice mode
Professional mode
Fully customizable to suit your needs