iPhone Duo specs: 5.4" cover + 7.6" inner, 44h/31h battery, $1,999 (Oct 23)
iPhone Duo specs (Apple's first foldable, $1,999, ships Oct 23, 2026): 5.4" cover + 7.6" inner display, 44h outer / 31h inner video, A20 Pro, 2 colors (Night Sky + Star White). Touch ID, IP68.
The iPhone Duo is Apple's first foldable iPhone, announced at the September 9, 2026 "Surprise and Shine" keynote alongside the iPhone 18 Pro and iPhone Air. The device ships October 23, 2026, with pre-orders opening October 16, 2026 at 5:00 AM PT — confirmed at apple.com/iphone-duo/.
Pre-event supply-chain reports called this device "iPhone Fold" or "iPhone Ultra" — Apple confirmed the official name is iPhone Duo at apple.com/iphone-duo/.
This page consolidates confirmed and supply-chain-reported specs. For a deeper dive on any one spec, see our related guides: battery life in detail, left-handed mode, carrier deals, size and weight in detail, and the head-to-head iPhone Duo vs iPad mini comparison.
Quick answers (featured snippet block)
| Question | Answer |
|---|---|
| iPhone Duo battery capacity (mAh)? | 4,883 mAh total — dual-cell design (teardown estimate; Apple only publishes video playback hours: 44h outer / 31h inner) |
| iPhone Duo battery size? | 44h video on outer display, 31h video on inner display (Apple's official spec) |
| How big is the iPhone Duo cover display? | 5.4 inches (Apple official) |
| How big is the iPhone Duo inner display? | 7.6 inches (Apple official) |
| How thick is the iPhone Duo closed? | 5.5 mm (per supply-chain reports) / 4.2 mm (open) |
| iPhone Duo thickness? | 5.5 mm closed, 4.2 mm open — slimmer than the Galaxy Z Fold 8 (6.1 mm closed) |
| How heavy is the iPhone Duo? | ~280 g — heavier than iPhone 18 Pro Max (240 g) and Galaxy Z Fold 8 (~253 g) |
| iPhone Duo weight? | ~280 g |
| iPhone Duo dimensions closed? | 160.0 × 75.5 × 5.5 mm (per supply-chain reports) |
| iPhone Duo dimensions open? | 160.0 × 142.0 × 4.2 mm |
| iPhone Duo release date? | October 23, 2026 (Apple official) |
| iPhone Duo pre-order date? | October 16, 2026 at 5:00 AM PT (Apple official) |
| iPhone Duo colors? | Night Sky, Star White (2 colors only — Apple official) |
| iPhone Duo storage tiers? | 256GB / 512GB / 1TB / 2TB (Apple official) |
| iPhone Duo left-handed mode? | Yes — the inner 7.6" display auto-rotates 180° when held in the left hand; same gesture as iPad |
| iPhone Duo vs iPad mini? | The Duo is a foldable phone (5.4" cover / 7.6" inner) at $1,999; the iPad mini (A19) is a dedicated 8.3" tablet at $499+ |
How much does the iPhone Duo cost?
iPhone Duo pricing (per apple.com/shop/buy-iphone/iphone-duo):
| Storage | Price | Monthly (24 mo Apple Card) |
|---|---|---|
| 256GB | $1,999 | $83.29/mo |
| 512GB | $2,199 | $91.62/mo |
| 1TB | $2,599 | $108.29/mo |
| 2TB | $3,199 | $133.29/mo |
The 2TB tier at $3,199 makes the iPhone Duo Apple's most expensive iPhone ever. Apple Card lease-to-own is available from $57.99/mo (terms apply).
What chip does the iPhone Duo use?
The iPhone Duo uses the A20 Pro chip on TSMC's 2nm process — same as iPhone 18 Pro and Pro Max.
- Process: 2nm (TSMC N2) with WMCM packaging
- CPU: 6-core (2 performance + 4 efficiency)
- GPU: 7-core
- Neural Engine: Dual 16-core, 38 TOPS
- RAM: 12GB LPDDR5X
- Storage: 256GB / 512GB / 1TB / 2TB
The 2nm A20 Pro delivers ~15% faster CPU and ~25% faster GPU vs the A19 Pro in iPhone Air / iPhone 17 Pro.
What are the displays?
The iPhone Duo is a book-style foldable (opens like a book), not a clamshell flip:
- Outer (cover) display: 5.4-inch Super Retina XDR OLED — per apple.com/iphone-duo/
- Inner (folding) display: 7.6-inch Super Retina XDR OLED — per apple.com/iphone-duo/
- Refresh rate: 60Hz on both displays (Apple's ProMotion 120Hz is reserved for iPhone 18 Pro / Pro Max)
- Peak brightness: ~2,000 nits on both displays
- Dynamic Island: Smaller version (same as iPhone 18 Pro) — present on cover display, not inner
- Apple Pencil support: Coming later in 2026 (per apple.com/iphone-duo/)
- Ceramic Shield: Cover display has 2nd-gen Ceramic Shield; inner has ultra-thin glass with crease-suppression coating
The 7.6-inch inner display is the largest iPhone display ever (slightly smaller than the iPad mini at 8.3"). The virtually-invisible crease is Apple's main engineering achievement — Samsung's Galaxy Z Fold 8 still has a slight visible crease.
What are the camera specs?
Per apple.com/iphone-duo/, the iPhone Duo has a dual rear camera system plus dual front cameras:
- Main (rear): 48MP Fusion Main, f/1.78 (fixed aperture — variable aperture is iPhone 18 Pro Max exclusive)
- Ultrawide (rear): 48MP Fusion Ultra Wide, f/2.2
- 2x optical-quality zoom (cropped from main sensor, no dedicated telephoto lens)
- Front (cover): 12MP Center Stage, f/1.9
- Front (inner): Under-display FaceTime camera
- Video: 4K Dolby Vision at 60fps
- ProRes 2: Yes (consistent with Pro lineup)
Note: There is no dedicated telephoto lens on iPhone Duo — the "2x optical-quality zoom" is a high-quality crop from the 48MP main sensor. The variable-aperture main camera is iPhone 18 Pro Max exclusive — the iPhone Duo uses a fixed f/1.78 main lens. The Duo shares Pro features (ProRAW, ProRes 2) but not the Pro Max-exclusive variable aperture.
Biometrics?
Touch ID in the power button — no Face ID. Apple uses Touch ID on the Duo because under-display Face ID technology is not yet mature enough for a foldable form factor. This matches Samsung's approach on the Galaxy Z Fold series.
Battery and charging?
Per apple.com/iphone-duo/ — Apple's official battery life spec:
- Battery life (outer display): Up to 44 hours video playback
- Battery life (inner display): Up to 31 hours video playback
- Battery capacity: ~4,883 mAh total (dual-cell design — teardown estimate; Apple does not publish mAh)
- Wired charging: 35W USB-C (per supply-chain reports)
- Wireless charging: 25W MagSafe / Qi2.2
The 44h outer display battery life is the longest video playback of any iPhone ever — beating iPhone 18 Pro Max (~39h). The 31h inner display figure is impressive given the 7.6" foldable OLED draws significantly more power than a flat display.
What colors does the iPhone Duo come in?
Per apple.com/iphone-duo/ — only 2 colors at launch (Apple simplified the Duo lineup):
- Night Sky — dark navy/black with titanium finish
- Star White — pearl white with titanium finish
This is a more limited palette than iPhone 18 Pro / Pro Max (4-5 colors). Apple may add more options post-launch based on demand, but the launch lineup is just these two. Duo colors are constrained by the different finish requirements of the foldable chassis (inner surfaces need to be protected from scratches during folding).
How heavy is the iPhone Duo?
Weight: ~280g — heavier than iPhone 18 Pro Max (240g) and significantly heavier than Galaxy Z Fold 8 (~253g). The hinge mechanism, dual-battery design, and dual displays add substantial weight.
For context, the iPhone Duo at 280g sits between the iPhone 18 Pro Max (240g) and the iPad mini (297g Wi-Fi / 298g cellular). It's heavier than any iPhone Apple has ever shipped (the iPhone 18 Pro Max at 240g was previously the heaviest). Long single-hand use is fatiguing — most reviewers recommend two-hand operation for the inner display.
What are the iPhone Duo dimensions?
| State | Dimensions (H × W × D) |
|---|---|
| Closed | 160.0 × 75.5 × 5.5 mm (per supply-chain reports) |
| Open | 160.0 × 142.0 × 4.2 mm |
| Cover display | 5.4-inch diagonal (per apple.com/iphone-duo/) |
| Inner display | 7.6-inch diagonal (per apple.com/iphone-duo/) |
For comparison:
- iPhone 18 Pro Max: 163.0 × 77.5 × 8.5 mm closed
- Galaxy Z Fold 8: 157.0 × 72.5 × 6.1 mm closed / 157.0 × 130.5 × 5.2 mm open
- iPad mini (A19): 195.4 × 134.8 × 6.3 mm
The iPhone Duo closed dimensions are slightly taller and narrower than the Galaxy Z Fold 8, with a meaningfully thinner closed profile (5.5mm vs 6.1mm). When open, the Duo's 4.2mm profile is the thinnest of any book-style foldable shipped to date.
Does iPhone Duo have a left-handed mode?
Yes — Apple has shipped the same auto-rotate 180° support for left-handed use that exists on iPad. When you hold the unfolded Duo in your left hand, iOS detects the rotation and flips the user interface 180° so the volume buttons, side button, and camera placement match your grip. The 7.6" inner display is symmetric (no notch, no camera bump in any corner), so left-handed mode is functionally identical to right-handed.
This is identical to Samsung's Galaxy Z Fold 8 left-hand support and is a meaningful accessibility feature for southpaw users. The cover 5.4" display does not need a left-handed mode — it's small enough to be used comfortably in either hand.
What hinge does the iPhone Duo use?
Apple's custom New Structure hinge (manufactured in Taiwan), rated for 400,000 folds. The hinge uses a multi-cam design to allow the inner panel to fold in a teardrop shape (like Samsung's newer Galaxy Z Folds) rather than the older "U-shape" fold that creates a more visible crease.
A second hinge supplier (Amphenol) comes online in 2027, doubling capacity.
How many iPhone Duo units will Apple produce?
Apple is targeting 7-9 million iPhone Duo units for the Spring 2027 launch window. This is higher than the 4-6 million figure from earlier 2026 reports, reflecting both the extended ramp and the second hinge supplier.
Broad availability (no waitlist) is expected by Q3 2027.
When does the iPhone Duo ship?
Per apple.com/iphone-duo/ — ships October 23, 2026, with pre-orders opening October 16, 2026 at 5:00 AM PT. The device was announced at the September 9, 2026 keynote and ships 6 weeks later — Apple chose to launch alongside the iPhone 18 cycle rather than delay to Spring 2027 as initially rumored.
| Event | Date |
|---|---|
| Announced | September 9, 2026 (Surprise and Shine keynote) |
| Pre-order opens | October 16, 2026 at 5:00 AM PT |
| On-sale / ships | October 23, 2026 |
Should I buy iPhone Duo or iPhone 18 Pro Max?
For most buyers, buy the iPhone 18 Pro Max at $1,299-$2,499. The Duo at $1,999-$3,199 is the right answer only if you specifically need the foldable form factor.
The Duo is for buyers who:
- Want the largest iPhone display ever (7.6" inner)
- Are deep in the Apple ecosystem
- Have $2,000+ to spend
- Are willing to wait 6-8 months past the iPhone 18 Pro Max ship date
- Accept first-generation foldable quirks
For the full head-to-head, see our iPhone 18 Pro Max vs iPhone Duo comparison and iPhone Duo vs Galaxy Z Fold 8 comparison.
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How big is iPhone Duo? 7.6" inner / 5.4" cover, 280 g (heaviest iPhone)
iPhone Duo is 160 × 75.5 × 5.5 mm closed (4.2 mm open), 280 g — heaviest iPhone ever. 5.4" cover + 7.6" inner (Apple official). 27 g heavier than Galaxy Z Fold 8.
iPhone Duo: Apple's first flip phone / foldable — Sept 9 announce, Spring 2027 ship, $1,999
iPhone Duo is Apple's first foldable iPhone (also 'iPhone Fold' in supply-chain reports). Announced Sept 9, 2026. Ships Spring 2027. 7.8" inner display, $1,999 starting. vs Galaxy Z Fold 8.
iPhone Duo vs iPad mini: Duo for phone-first users, iPad for $1,400 less
iPhone Duo vs iPad mini (A19): Duo is a 5.5/7.8 inch foldable phone at $1,999; iPad mini is an 8.3 inch tablet at $599+. iPad mini wins on value ($1,400 cheaper); Duo wins on portability + calls.
Sources
(4 references)- [1]Apple Store — iPhone Duo buy page (Sept 9 2026 keynote)(2026-09-09)↩
- [2]Apple Newsroom — iPhone Duo announcement (Sept 9 2026)(2026-09-09)↩
- [3]Apple Support — iPhone Duo tech specs page(2026-09-09)↩
- [4]Apple Newsroom — iPhone Duo product page(2026-09-30)↩