I had a student ask if they could engrave their Iphone and I had to reply with “theoretically yes…”, which I didn’t like. So I finally pulled the trigger and etched mine to make sure I could say yes with confidence. I used the Iphone 7 proofgrade settings, shut down my Iphone SE, taped the front and camera (just for good measure), and popped it in. It came out beautifully! The lines are crisp and perfect depth so that it stays around for the life of the phone. These machines impress me on a daily basis.
Also, I’m glad that the image stayed up on the bed camera long enough to snag it with snipping tool, hard to take a picture of it considering it’s on the back of the only camera I own.