Yes it’s not super easy but I’ve figured it out.
Three fingers on the back. Pinky holding the phone from the bottom where the lightening port is.
Thumb can reach and use the bottom half of the screen. But I’m able to use the phone one handed like that.
Try AssistiveTouch. I wrote about it hereI was thinking of upgrading my iPhone X to a space gray MAX.
I have normal size male hands and was wondering if there was a way to use it comfortably with 1 hand.