It has a base price of about $2,800. Huawei unveiled the Mate XT Ultimate last week as the world's first tri-folding smartphone. It is

The phone is a piece of engineering marvel: when unfolded, the device measures only 3.6mm thick, making it the new thinnest portable computing device in the world. This slimness is needed, because when completely folded up, it is essentially three stacked layers, which then does increase thickness to 12.8mm.

Limited supplies of Huawei's tri-fold smartphone, the Mate XT, spurred prices to more than double or triple ahead of the official launch.