Apple's Foldable iPhone Is 4.5mm Thin When Open

The thickness number is the headline. But it's the fourth or fifth most remarkable thing about this device. The 13-inch iPad Pro is Apple's thinnest current product at 5.1mm. The iPhone Air — Apple's recent slim-focused phone — sits at 5.6mm. At 4.5mm unfolded, the iPhone Ultra would be thinner than...