Apple has unveiled its first foldable phone, the iPhone Duo, but early hands-on photos suggest the crease at the center of the folding display has not disappeared completely. The crease appears in certain viewing angles or lighting, while it is difficult to spot when viewed head-on. Apple said it used a custom nano-texture finish and optical clear adhesive to reduce glare, reflection and strain on the display.

Apple’s first foldable iPhone, unveiled on Sept. 9 local time and named iPhone Duo, is the second foldable smartphone to use the “Duo” name after Microsoft’s Surface Duo. Microsoft avoided a flexible folding screen by linking two 5.6-inch OLED panels, but software problems and other shortcomings hurt the product and it was discontinued. Apple is moving early on developer support and app compatibility ahead of an October full-compatibility rollout.