How to get iPhone APP screen WIDTH
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 320x480 but an actual resolution of 640x960
( reference https://iosref.com/res )
I cannot get a breakdown to show how many visitors using the iPhone app are at 320 width.
Can Omniture show this? Does anyone know how? Even a list of what version of iPhone device would be fine because I could look that up.

