With the growing popularity of gadgets with display screens, the importance of screen protectors ( aka scratch guards ) is improving too. If you do not have a damaged or scratched screen on your phone, it's highly recommended that you should get an economical screen protector as soon as possible. But applying a screen protector to your phone requires a special technique so that you don't accidentally leave bubbles or dust particles on your screen. In fact, that might end up doing more damage to your screen. Check out following video with detailed instructions on the most proper technique to apply a screen protector. The technique requires a lint-free cloth, scotch tape and a credit card to press the guard on the surface of the screen. If you think the Gorilla glass on your mobile is scratch-free; then think again. I've seen the glasses get scratches; I don't know how, though.