This may seem obvious, but for people of a certain age, a folding phone or flip phone was one that had a small screen up top and ... looks like a big, shiny, glass-coated, worth-a-month’s ...

Samsung’s Galaxy Z Flip has something that’s been on no other foldable phone to date: a folding glass screen. So far, every foldable phone and tablet has relied on plastic to cover up the display.