iPhone Duo Doesn't Have an Action Button
The iPhone Duo does not include an Action Button, according to the device's technical specifications page. The page's diagram highlights volume up/down buttons at the top, Camera Control and side buttons on the right side, a USB-C port at the bottom, and microphones and speakers at the top and bottom.

On the iPhone 18 Pro models and earlier, the Action Button is located on the left side of the iPhone right above the volume up/down buttons.
The Action Button is a customizable button that can be assigned one of several actions. It can do things like activate Silent mode (the default), set a Focus, turn on the Flashlight, record a Voice Memo, activate Visual Intelligence, or run a Shortcut.
Apple introduced the Action Button with the iPhone 15 Pro, and all iPhones released since then have included the feature. The iPhone Duo is the first iPhone that has no option for a physical mute toggle. Silent mode will need to be turned on via Control Center.
The side button on the iPhone Duo includes Touch ID for unlocking the device, because it does not support Face ID. There's also a separate Camera Control button for launching the camera and capturing photos.
Popular Stories
Apple hardware engineering VP Tom Marieb spoke with TechRadar and shared some candid thoughts about Apple's upcoming iPhone Duo.
The iPhone Duo uses a matte nano-texture display, which is meant to cut down on glare and minimize the visibility of the crease. When asked if the iPhone Duo's crease would be more visible over time, as that's what tends to happen on other foldables, Marieb said...
Apple on Instagram today shared a curated gallery of six photos shot on the iPhone Duo. The photos were shot by American photographers Jake Michaels and Jason Nocito, as part of a project commissioned by Apple.
iPhone Duo is equipped with four cameras:A rear 48-megapixel Fusion Main camera
A rear 48-megapixel Ultra Wide camera
A front 12-megapixel Center Stage camera in the outer display
A...
The iPhone Duo is reportedly facing production difficulties ahead of its October launch, with early output expected to be limited.
A person said to be close to Foxconn's supply chain told China's Jiemian News that final assembly yields for Apple's first foldable iPhone were only slightly above 60% as of September 17. The source said that, under Apple's current quality standards, it could...