Simply turn on your phone volume and shake the app and it will do the talking. We figured it should work as you might have jitters when you approach someone.
This app also comes with a type to text function, allowing you to type anything you want and let the phone do the talking for you. A good use of this is to type the name of the (girl or guy) you are approaching, type their name, on the screen, press the talk button, and then shake your phone for the pickup line.
It's guaranteed to break the ice and give you all a good laugh. The next steps are up to you.