A genuine leather case doesn't just provide the necessary protection for your smartphone, it also adds a stylish, high-quality look. Book cases often have room for your cards and bills. A pouch also has room for your phone and some cards. Choose a case with fall protection if you want your phone to remain intact when you drop it. With a case with a built-in stand, you can place your phone upright. For example, if you want to watch a video.