NEW YORK—The full smartphone manufacture is slumping but for the priciest devices. Samsung Electronics Co. is investigating the limits of that high-end demand.

On Wednesday, Samsung unveiled its latest models of 2 of the world’s most-expensive phones. The Galaxy Z Fold 4, which becomes the size of a tiny tablet erstwhile opened, volition outgo astir $1,800. The much compact Galaxy Z Flip 4 volition spell for astir $1,000. The phones person prices akin to last year’s versions and go disposable successful the U.S. aboriginal this month.