The only time my phone has ever gotten scratched was one time on Madison Avenue when a guy jumped out of his car and started throwing punches at me because I'd yelled at him for almost hitting someone. Rather than reciprocate the fisticuffs I thought I'd call the cops. He grabbed my phone out of my hand and threw it halfway across the avenue. It was a BlackBerry Bold and I thought it would be smashed for sure. Went to retrieve it and to my surprise it only had a little scratch on the case. After the guy drove away a woman came up to me and said "excuse me, is this phone yours as well?" It was a Samsung and the screen was smashed. Turns out when the guy leaped out of his car, he had his phone in his hand and when he grabbed mine with that same hand, in his anger he threw them BOTH into the road! I laughed so hard at the thought of him realizing what he'd done. That Samsung went straight in the trash.
Some people seem to smash their phone screens on a regular basis. I have an employee whose screen is perpetually smashed. He gets a new one and then that one is smashed a couple of weeks later. I have no idea how these people are breaking their screens.