iPhone started the back gesture swipe from the left side of the screen, but in MY opinion Android did it better by letting you swipe from either side AND making it much easier to trigger. I find it finicky on the iPhone sometimes. If you’re scrolling even a LITTLE BIT forget about it. It also takes such a precise and defined swipe to get it to trigger sometimes. I like the iPhone UI overall, but this is one area where I see room for improvement.