HHAHAHAHA Its not just for Iphones. Droid Pixel 2, XL
Line Density to 270.
Did the cardboard jig first. Set up the file with a rectangle the size of the phone and placed the artwork inside.
Ignored the artwork, cut the rectangle. Then used a piece of blue tape to pull the rectangle out without disturbing the rest of the cardboard.
Placed the phone and set the cut to ignore and the artwork to engrave.
(Still managed to fail on the invert after the trace… shhh)