I have only had my iPhone 6s Plus for two weeks, I've never placed it in my back pocket nor in my front pocket and it is still warped. I carry my phone in the side pocket of my carpenter style jeans which by their very nature have looser legs than standard pants. I do agree if a person places their 5.5" iPhone in their back pocket and sit on it and then wonder how it got warped they're crazy. But we are dealing with a much larger issue here, I carried around my Galaxy Note 5 in the same side pocket for 8 months and never had an issue. It seems the fabled Apple quality product has been replaced with a chintzy knock off and for an $800+ phone and the fact that it's an Apple product that it be the definition of quality.