The default outcome is "Truth", but you can change it by pressing the hidden button on the bottom left (when you press it your phone will vibrate). This is perfect if you want to ask some "control questions" to convince your friends this is the real deal. If you can''t find the button, press the menu button to show or hide them.
What if your friends decide they want to try it out for themselves? No problem! Just press the hidden button on the bottom right of the screen and hand them your cellphone. They will ask a question and a message saying their phrase couldn''t be analyzed will flash on the screen. At that moment just say some dumb excuse (too much noise, app not used to your voice...be creative!) and take your phone back!