I think am almost a month into owning my passport, using it on a daily basis as my main phone!
getting used to typing on the physical keyboard wasn't that hard at all... lately' am actually finding myself typing without even looking at the keyboard. (much faster and more accurate)
Now the question is where did it hurt? !! .... before ditching my iphone, i liked laying on bed at night and browsing a few websites here and there.. writing a couple messages before passing out lol... and guess what!! I found out the hardway how much it's tiresome to type with the passport laying on your back and how much it hurts when that square falls on your face pointy edge first.
So a little word of advise, try to be more cautious when you first get your passport. Dont text and drive + don't text and lay on you back lol.
My Torch 9800 was so top heavy that this always happened to me while laying in bed. It may not have had any sharp corners, but that thing was as heavy as a brick!