Everything I read (including on Stack) keeps saying that in order to have an app use the entire 4" iPhone screen you simply have to add a default-568h@2x.png image with a resolution of 1136 x 640.
I've added this image and when I run on a 4" iPhone simulator everything (including the launch image) renders windowed with the black bars at the top and bottom. I've tried deleting and re-adding the image, made sure it shows up as the 4" launch image in the Target summary tab, and adjusted all of the simulated metrics sizes in my storyboard to be Retina 4 full screen. Even with all of this, I'm still getting the old 3.5" window.
Is there something I'm missing or doing wrong?