I had a Lumia 920 that I dropped down three flights of stairs and it still worked with only minor scratches on the plastic and one scratch on the screen. I'm not sure you can do that with any of the Lumia flagships that followed that one though. They caved to the "thinner is better" market, even though the 920 was thinner and lighter than an iPhone with an Otterbox or Lifeproof that a lot of people have.