I think mine is stated as 6.7" and pretty thin. I wouldn't say it fits comfortably in all conditions. In some trousers/shorts it either sticks out a bit or digs in my side when I'm sat and bend (to tie a show, etc).

And it would still fit in your pocket even if it was few more millimetre thick. And, it is better to make the pockets bigger by a few millimetres rather than making the phones thicker.