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PHONES

Apple iPhone Duo · 256 GB

256 GB · Night Sky · UK A3720 · dual eSIM · Apple part MK2E4QN/A

Inner display size
7.6 in
Storage
256 GB
Maximum refresh rate
120 Hz

iPhone Duo is Apple's folding iPhone: a 7.6-inch inner screen opens up for larger layouts, and a 5.4-inch outer screen handles quick tasks when closed. This is the 256 GB Night Sky UK configuration, powered by the A20 Pro chip, with Touch ID and eSIM only. Announced on 9 September 2026, with availability scheduled for 23 October.

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THE ACTUAL PRODUCT
iPhone Duo in Night Sky, official Apple front and rear product views; open folding display shown
Official product image · Image source detailsProduct imagery does not establish a retailer’s bundle or condition.
Compare with Google Pixel 10 Pro Fold

Specifications checked 9 Sept 2026Manufacturer specifications, not a hands-on test.

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The nearest checked phones by key specifications, with what differs from the Apple iPhone Duo · 256 GB. The first matches the Compare button above.

The useful part.

Key strengths

The inner and outer displays support adaptive refresh up to 120 Hz.

The foldable layout provides separate large-screen and compact viewing modes.

Apple claims up to 44 hours of video playback on the outer display (31 hours on the inner), and up to 50% charge in around 20 minutes with a 60 W-capable adapter.

USB-C supports USB 3 up to 10 Gb/s and DisplayPort, and Apple says Apple Pencil (USB-C) support arrives on either display later in 2026.

The checks that matter.

Before you buy

There is no dedicated telephoto camera: the 2× setting crops the 48 MP main sensor, alongside a 48 MP ultra-wide.

The UK model has no physical SIM slot. Check your operator’s eSIM support.

At 254 g and 11.3 mm thick when closed, handling differs substantially from a conventional phone.

No charger in the box: Apple lists only the iPhone and a USB-C charge cable.

The inner under-display FaceTime camera records video only up to 1080p at 60 fps.

Every specification. With its source.

Full specifications

Exact configuration: 256 GB · Night Sky · UK A3720 · dual eSIM · MK2E4QN/A

52 specifications in 10 groups. Values are manufacturer specifications unless a row says “Measured result” or “Calculated from cited specifications”.

Display

6 items
Inner display size
7.6 in

Inner display when open; outer display is 5.4 inches.

Source
Maximum refresh rate
120 Hz

Adaptive ProMotion; refresh depends on content.

Source
Display specification
Main: 7.6-inch OLED, 2670 × 1878; Cover: 5.4-inch OLED, 2034 × 1398; both up to 120 Hz, 3000 nits peak (outdoor)

Inner 430 ppi, cover 460 ppi; ProMotion adaptive refresh on both displays.

Source
Inner pixel density
430 ppiSource
Published outdoor peak
3000 nits

Manufacturer claim, not an independent measurement.

Source
Outer display
5.4-inch OLED · 1398 × 2034 · 460 ppi · up to 120 HzSource

Performance & storage

4 items
Storage
256 GBSource
RAM
Not provided

Not published by Apple.

Source
Chipset
Apple A20 Pro · 6 CPU cores · 7 GPU cores · dual 16-core Neural EngineSource
RAM and storage configuration
RAM not published; 256 GB storage

Apple does not publish RAM capacity.

Source

Cameras & video

10 items
Rear camera modules
2Source
Camera system
Main: 48 MP (f/1.6, OIS), 2x crop mode; Ultra-wide: 48 MP; Front: 12 MP (cover), under-display camera (inner); Video: up to 4K 120 fpsSource
Native telephoto reach
0×

No dedicated telephoto module; the 2× mode is a crop.

Source
Optical-quality zoom
2×

Manufacturer crop-mode claim; not a separate lens.

Source
Front cameras
Outer: 12 MP Center Stage, f/2.2. Inner: under-display FaceTime camera, f/1.8; resolution not published.Source
8K video recording
Not provided

8K recording is not mentioned.

Source
Published professional camera workflows
0

The existing capability model counts RAW stills, professional codecs, log capture and external production tools. Apple does not list these four workflows in the complete Duo photo/video specifications.

Source
Main camera optical stabilisation
Yes

Sensor-shift OIS is stated for the 48 MP Fusion Main (including its 2× mode); the Ultra Wide lists no OIS.

Source
Rear 4K recording maximum
120 fps

100 and 120 fps are Fusion Main only. Manufacturer recording-mode claim; not an independent quality or sustained-recording test.

Source
Front 4K recording maximum
60 fps

Outer 12 MP Center Stage camera. The inner under-display FaceTime camera records up to 1080p at 60 fps.

Source

Battery & charging

8 items
Wireless charging
YesSource
Battery and charging
Up to 31 h video (44 h on cover screen); fast wired charging (60 W adapter), 25 W wireless

Apple does not publish battery capacity in mAh. Up to 50% in around 20 minutes with a separately sold 60 W-capable or higher USB-C adapter; MagSafe and Qi2 up to 25 W. Apple claims, not independent tests.

Source
Inner-display video playback
31 hours

Apple UK local-video claim; inner display. The 44-hour outer-display claim is a different mode.

Source
Claimed streamed video
26 hours

Inner display.

Source
Time to 50% wired charge
20 minutes

Apple claim with a separately sold 60W-capable adapter.

Source
MagSafe / Qi2 charging
25 W

Compatible charger and adapter required.

Source
Outer-display video playback
44 hours

Different mode from the 31-hour inner-display claim.

Source
Typical use
24 hours

Apple typical-use claim based on equal use of the inner and outer displays; distinct from video playback and not a cross-brand endurance test.

Source

Design & durability

10 items
Weight
254 gSource
Dimensions
Closed: 117.8 × 84.1 × 11.3 mm; open: 117.8 × 164.6 × 5.2 mm (height × width × thickness)Source
Closed width
84.1 mmSource
Height
117.8 mmSource
Closed thickness
11.3 mmSource
Form factor
foldableSource
Colour
Night SkySource
Ingress protection
IP68

Apple controlled test: 6 metres for 30 minutes; resistance is not permanent.

Source
Open width
164.6 mmSource
Open thickness
5.2 mmSource

Connectivity & audio

2 items
Connections
USB-C · DisplayPort · USB 3 up to 10 Gb/sSource
Wireless connectivity
Wi-Fi 7 · Bluetooth 6 · ThreadSource

Network & SIM

3 items
Regional SIM / network configuration
UK model A3720; eSIM only

Dual eSIM (two active eSIMs); no physical SIM slot; 5G (sub-6 GHz). Carrier eSIM support needs confirming with your network.

Source
eSIM only
YesSource
Cellular modem
Apple C2

Listed in the UK Mobile and Wireless section for model A3720.

Source

Software & support

3 items
Update policy
No fixed update period published; ships with iOS 27.1Source
Launch operating system
iOS 27.1Source
Stylus support
Apple Pencil (USB-C), announced for later in 2026

Apple says support arrives later this year on either display, so it may not be available at launch.

2 sources

Sensors & security

1 item
Biometric authentication
Touch ID in the side buttonSource

Box, price & availability

5 items
Announced
2026-09-09Source
Pre-orders open
2026-10-16Source
Announced availability
2026-10-23Source
Apple UK reference price
£1,999

Announced 256 GB configuration price; not a current retailer offer.

Source
US specification difference
US model A3447 is also eSIM only (dual eSIM) and adds 5G mmWave (bands n258, n260, n261); its video-playback claims match the UK model.Source
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