The Oppo Finder currently holds the silly title of being the thinnest smartphone in the world. Measuring in at a svelte 6.65mm, the Finder is 1.95mm and 2.75 thinner than the Galaxy S III and iPhone 4S, respectively. But the thin size doesn’t mean the phone is fragile. In fact the company recently demonstrated the phone’s toughness by using it to hammer several nails into a wooden board.