Flip-style folding phones are fairly straightforward, but book-like folding phones that double as tablets have new multitasking tricks that will take some getting used to if you want to make the most of them. My Favorite Folding Features AccordionItemContainerButton LargeChevron Photograph: Julian Chokkattu Whichever style you go for, my favorite feature of folding phones is the ability to see the viewfinder on the external screen and snap a selfie with the high-quality rear cameras—just set the phone down slightly folded so it stays upright, and there's usually a button you can click in the camera app to send the preview to the external screen.