I'm careful with my possessions, and I've never felt the need for a case before, either for my (cheap) phones or for my iPad. However, someone in my house is convinced that phones are cat toys, and, despite my best efforts not to put them down where they'll be noticed, they occasionally get swatted off the edge of tables. I am not
going to risk my nice new iPhone 5s
landing on the floor unprotected. It's happily ensconced in a gray and white Otterbox.