Key numbers
| Item | Apple’s listed specification | Why it matters |
|---|---|---|
| Open dimensions | 6.48 in wide × 4.64 in high × 0.21 in deep | The open footprint is closer to a small tablet than a normal slab phone. |
| Closed dimensions | 3.31 in wide × 4.64 in high × 0.44 in deep | The folded body changes pocket fit and case choice. |
| Weight | 8.96 oz / 254 g | Compare this with the phone you carry, not only with other foldables. |
| Displays | 7.6 in inner; 5.4 in outer | Different layouts and tasks can make the two panels feel like separate contexts. |
| Storage | 256 GB, 512 GB, 1 TB, or 2 TB | Capacity is selected at purchase; it is not a later upgrade. |
| Video playback | Up to 31 h inner / 44 h outer | Apple’s claim is not the same as a universal real-world runtime. |
| Typical use | Up to 24 h | Apple’s typical-use claim is separate from its video-playback figures. |
| Charging | Up to 50% in around 20 min wired with a 60W-capable adapter; around 30 min wireless with a 35W adapter and MagSafe Charger | The adapter, cable, charger, temperature, and battery state matter. |
| Wireless | Wi-Fi 7, Bluetooth 6, Thread, and 5G | The radio capability does not guarantee a particular network speed or carrier result. |
| SIM | Dual eSIM; no physical SIM compatibility | Activation and transfer still depend on the carrier. |
| Physical controls | Volume up/down, Camera Control, and a Touch ID side button; no Action Button or Ring/Silent switch is listed | Silent mode and former Action Button shortcuts need a software or other-button path. |
No Action Button: how Silent mode changes
Apple’s iPhone Duo hardware diagram lists volume up/down, Camera Control, and a side button with Touch ID. It does not list an Action Button or Ring/Silent switch. Independent launch coverage describes the same omission, while current community discussion shows that owners of recent iPhones are already asking how they will mute the Duo or replace an Action Button shortcut.
For Silent mode, launch coverage points to the software control in Control Center. Apple’s general iPhone guide also documents a Silent mode setting under Settings > Sounds & Haptics on models with an Action Button. Because iPhone Duo is scheduled to ship with iOS 27.1 on October 23, confirm the exact label and placement on the release build rather than assuming an older iPhone’s physical-button instructions apply.
Camera Control remains available for camera access. For another former Action Button task, use the corresponding Control Center control, app, Siri, Back Tap, or Shortcut only when the release software exposes that option; do not treat Camera Control as a universal replacement for every Action Button action.
Important qualifiers
The dimensions are listed separately for open and closed positions. A case, folio, hinge clearance, and the way you hold the device will change the practical experience.
The phone is eSIM-only according to Apple’s specifications, and Apple lists an IP68 rating under defined conditions. Neither statement should be expanded into a promise about every carrier, repair outcome, or water incident.
Apple separates wired and wireless fast-charge conditions. A listed maximum is not a guarantee that every adapter, cable, case, charger, temperature, or battery state will produce the same result.
Compare safely
For a purchasing decision, start with Duo versus iPhone 18 Pro Max. For a new-owner handoff, use the first-day checklist rather than optimizing around one headline specification.
Confirmed
- Apple lists the inner and outer display sizes, open and closed dimensions, weight, storage tiers, charging standards, and battery playback claims.
- Apple lists Touch ID in the side button and dual eSIM with no physical SIM compatibility.
- Apple’s external-controls diagram lists volume buttons, Camera Control, and a side button but no Action Button or Ring/Silent switch.
- Apple lists up to 24 hours of typical use, up to 50% wired charge in around 20 minutes with a 60W-capable adapter, and around 30 minutes wirelessly with a 35W adapter and MagSafe Charger.
- Apple lists Wi-Fi 7, Bluetooth 6, Thread, 5G, MagSafe up to 25W, and Qi2 up to 25W.
Provisional
- Real-world battery life, pocket comfort, crease visibility, and app behavior require independent testing and vary by use.
- The exact Silent mode control placement and replacement options should be verified on the shipping iOS 27.1 build.
FAQ
How much does iPhone Duo weigh?
Apple’s specifications list 8.96 ounces, or 254 grams. That is the phone figure before adding a case or folio.
How big is the iPhone Duo screen?
Apple lists a 7.6-inch inner display and a 5.4-inch outer display, each with its own resolution and pixel density.
Does iPhone Duo have a physical SIM tray?
Apple’s specifications say it is not compatible with a physical SIM card and uses dual eSIM.
Does iPhone Duo have an Action Button?
No Action Button appears in Apple’s official external-controls diagram. Apple lists volume up/down, Camera Control, and a Touch ID side button instead, and multiple launch reports identify the Action Button as absent.
How do you put iPhone Duo on Silent mode?
Launch coverage points to the software Silent mode control in Control Center. Recheck the exact location on the shipping iOS 27.1 build because iPhone Duo has neither an Action Button nor a Ring/Silent switch in Apple’s hardware diagram.
Sources
- Apple iPhone Duo technical specificationsDimensions, displays, power, cameras, controls, and connectivity.
- Apple iPhone DuoFeature explanations and comparison context.
- Apple: Use and customize the Action buttonWhat the Action Button normally controls on supported iPhones.
- Apple: Silence iPhoneApple’s current software and hardware Silent mode paths.
- MacRumors: iPhone Duo doesn't have an Action ButtonIndependent launch coverage of the omitted control and software Silent mode path.
- Reddit: iPhone Duo doesn't have an Action ButtonDemand signal for replacing mute and shortcut workflows; not evidence for hardware claims.