How I solved it was to NOT look for the width and height.  That was a wild goose chase.  But instead to look for the iPhone device Identifier, and from there, I could gather the info I wanted.   This link will tell you what rez per device https://iosref.com/res    This one will tell you the identifi...

I am trying to see how many older iPhones use our iOS Mobile APP at 320 WIDTH.  Not website. How do I look and get this data?   Due to pixel density AKA retina screens ...  iPhone SE gen1 - has a logical resolution of 320x568 but an actual resolution of 640x1136 iPhone 4s has a logical resolution of...