The Mate XT was the world’s first trifold smartphone when it launched last year but the sequel has debuted with a major change. Instead of the original’s Z-shaped arrangement of folding panels, the Huawei Mate XT 2’s side panels each fold inwards meaning you can only use its larger screen when the device is fully unfolded. Preorders are now open in China, but full pricing won’t be known until September 7th.