I got my first cell phone in middle school, and I knew that if it broke I wasn't getting another one, so I made sure to hold it securely when using it, since I didn't want to drop and break it. When I eventually upgraded to a smartphone a few years after they started getting popular, I held it even more securely, since it was even more expensive, and even more fragile. At this point it's just second nature to me to handle phones like I'm transporting fine china.