Gather two or three people together. Choose a word category (e.g., Animals), then place the phone on your forehead. The task is to guess the word displayed on the screen. The others will help you with this. They need to describe the word without saying it directly. To move on to the next word, tilt the phone. If you've guessed the current word, tilt it downwards; if you'd rather pass, tilt it upwards.
Try to guess as many words as possible before the game time runs out!

Oh, and if you get bored with the basic categories, you can create your own as well!