Carla is looking for a good microSD for her Samsung Galaxy S3, but she keeps hearing about them crashing. Leo says that microSD cards can crash like anything else. Sandisk is his brand of choice. What class should she get? Leo says class 4 or better is fine, but she shouldn't spend a lot of money on class 10 cards because a cellphone can't really use that speed. Since they can crash, it's vital for her to back up her images and videos as often as she can.