What was surprising is that the screen didn't scratch at all.
I didn't use a screen protector of the Galaxy S9, and yet it didn't suffer any scratches. Any blemish you see on the screen is dust, or a reflection of the sun.
The Galaxy S9's display uses Gorilla Glass 5, which is tough and scratch-resistant glass. Gorilla Glass 5 is also used in other high-end smartphones from Google, LG, HTC, and even less expensive phones from OnePlus. With that in mind, you could say that other phones with Gorilla Glass 5 would escape the car treatment without a scratch. But I wasn't willing to place more phones under my car's tires to test the theory.
Apple's latest iPhones – including the iPhone 8 and iPhone X – could also potentially fare just as well as the Galaxy S9, if not better. According to 9to5Mac, Apple worked with Gorilla Glass to make its own tough glass that's even tougher than Gorilla Glass 5.
The glass on the back and the camera were unscathed.
I was worried that the glass on the back of the Galaxy S9 could have cracked while inside the case, but I was relieved to find that nothing happened to BI's Galaxy S9 review unit — it probably would have meant answering some awkward questions.
And it's still 100% functional.
Use a case, people. You never know what could happen to your expensive smartphone. I certainly wasn't expecting to run this one over.