Apple's Vice President of Hardware Engineering Tom Marieb discussed iPhone Duo's durability features in a TechRadar interview, highlighting the hinge design with optimized torque profiles and the nano-texture matte display finish to minimize visible creases. Marieb emphasized extensive engineering work on the hinge to achieve a premium feel and praised Ceramic Shield 2 technology as eliminating the need for screen protectors.
Blogger Nicolas Lellouche discovered a new 'Shift Left Edge' setting in iPhone Duo's display options that adds a black border to the outer screen to improve compatibility with cases that cover the left edge. The feature doubles the border width and is designed to push content away from the folding edge when certain cases partially obscure the display. Apple offers two first-party cases at launch, though it remains unclear which specific case designs necessitate this setting.