The big phone news, though, was about a device that is kind of not a phone: the iPhone Duo, a $2,000 foldable device that Apple describes as like a “passport.” When closed, it looks like a slightly widened 5.4-inch iPhone; when opened, it expands into a 7.6-inch miniature tablet. Like numerous Android folding devices before it, it relies on a mechanical hinge and a flexible display with a seam (ideally, not prone to failure) in the middle.
https://nymag.com/intelligencer/article/new-at-apple-pricey-iphones-and-a-watch-that-eavesdrops.html