That must be one hell of a tight front pocket to do that walking .. the aluminium is bent.Mine bent as well. I did not sit on it. It was in my front pocket, the glass came loose from the screen. I believe it may have been defective, it is a brand new iphone 7. I was walking, and when I took it out of my pocket, I noticed that the phone was not aligned with the otterbox case. I took it out and realised it was very seriously damaged. The LCD is incapable of producing black colors on the screen, and the speakers make weird noises. This is absolutely unacceptable for a 700 dollar phone, I wish I bought an s7 instead. If Apple does not replace my phone for free, or for a reasonable price, I will never purchase another Apple product, although, for a multi-billion dollar company like Apple, that won't matter to them very much. I have had 2 Ipads, a Mac, and 5 Iphone's, upgrading with new generations. I never experienced something like this. I believe the screen may have come off due to the adhesive melting with to much heat. I had joggers on, and they were very loose, so pressure could not have been the reason.
Good luck