Because of the iPhone Duo’s foldable design, you tend to switch the orientation of the device more often than you would a regular iPhone. This makes the volume buttons shift positions a lot relative to your fingers, which can cause you to press volume up when you meant to press down, or vice versa. To prevent this, the iPhone Duo has an option in Settings which can dynamically remap the buttons as you rotate the device, so that the button on the top or right always turns the volume up, while the one on the bottom or left always turns it down. The system setting works by disabling the mechanism that keeps the volume controls in a fixed position whichever way you hold the phone. The following steps show you how it’s done. Open the Settings app. Tap Sounds & Haptics . Turn off Fixed Position Volume Controls …
