Samsung Electronics Co. unveiled its first so-called trifold smartphone, flaunting its engineering prowess in foldable

devices even as the broader category has yet to catch on with mainstream consumers.

The handset, called the Galaxy Z TriFold, is part of a small subset of folding phones that have two hinges, allowing

them to transform into larger, tablet-sized devices. Samsung is initially launching it in South Korea on Dec. 12 with a

price of 3.59 million won (about $2,450). It plans to sell the phone in the US, but hasn’t shared pricing. The TriFold

will also be available in other markets, including China, Taiwan, Singapore and the United Arab Emirates.