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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.
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Apple iPhone Duo

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

A folding iPhone with a 7.6-inch inner screen for larger layouts and a 5.4-inch outer screen. This is the 256 GB Night Sky UK configuration; it uses eSIM and Touch ID. Announced on 9 September, with availability scheduled for 23 October.

Reviewed 9 Sept 2026Manufacturer specifications, not a hands-on test.
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Prices & buying options

UK
Available at AmazoneBay
US
Available at AmazoneBay

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UK reference £1,999Apple — manufacturer reference price, opens in a new tab
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WHAT IT BRINGS

The useful part.

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

Manufacturer source

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

Manufacturer source
BEFORE YOU CHOOSE

The checks that matter.

These are launch specifications, not independent performance, camera or battery tests.

Manufacturer source

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

Manufacturer source Manufacturer source

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

Manufacturer source

Availability is announced for 2026-10-23; retailer search links do not establish stock or a preorder.

Manufacturer source
NOTHING HIDDEN IN THE SMALL PRINT

Every specification.
With its source.

Our publishing standard
Display specification
Inner: 7.6-inch OLED, 1878 × 2670, 430 ppi; outer: 5.4-inch OLED, 1398 × 2034, 460 ppi; both up to 120 Hz
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Manufacturer specification

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Chipset
Apple A20 Pro · 6 CPU cores · 7 GPU cores · dual 16-core Neural Engine
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Manufacturer specification

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RAM and storage configuration
256 GB fixed storage; RAM capacity is not published in Apple’s specification
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Camera system
48 MP main (f/1.6) and 48 MP ultrawide; 2× mode crops the main sensor; no dedicated telephoto module
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Battery and charging
UK claim: up to 31 h local video on the inner display; up to 44 h on the outer display; up to 50% in 20 minutes with a 60W-capable USB-C adapter; adapter sold separately. Battery capacity in mAh is not published.
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Dimensions
117.8 × 84.1 × 11.3 mm (height × width × thickness); closed. Open: 117.8 × 164.6 × 5.2 mm
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Weight
254 g
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Regional SIM / network configuration
UK model A3720: dual eSIM; no physical SIM slot; 5G sub-6 GHz. Carrier services need separate confirmation.
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Update policy
Apple has not published a fixed model-specific software-support duration in the checked launch specifications. Announced to ship with iOS 27.1.
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Storage
256 GB
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RAM
Not provided
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Not published by Apple in the checked specification. · Manufacturer specification

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Inner display size
7.6 in
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Inner display when open; outer display is 5.4 inches. · Manufacturer specification

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Maximum refresh rate
120 Hz
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Adaptive ProMotion; refresh depends on content. · Manufacturer specification

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Inner pixel density
430 ppi
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Published outdoor peak
3000 nits
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Manufacturer claim, not an independent measurement. · Manufacturer specification

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Closed width
84.1 mm
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Height
117.8 mm
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Closed thickness
11.3 mm
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Form factor
foldable
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Colour
Night Sky
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Inner-display video playback
31 hours
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Apple UK local-video claim; inner display. The 44-hour outer-display claim is a different mode. · Manufacturer specification

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Claimed streamed video
26 hours
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Inner display. · Manufacturer specification

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Time to 50% wired charge
20 minutes
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Apple claim with a separately sold 60W-capable adapter. · Manufacturer specification

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Wireless charging
Yes
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MagSafe / Qi2 charging
25 W
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Compatible charger and adapter required. · Manufacturer specification

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Ingress protection
IP68
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Apple controlled test: 6 metres for 30 minutes; resistance is not permanent. · Manufacturer specification

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eSIM only
Yes
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Native telephoto reach
0 ×
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No dedicated telephoto module; the 2× mode is a crop. · Manufacturer specification

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Optical-quality zoom
2 ×
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Manufacturer crop-mode claim; not a separate lens. · Manufacturer specification

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Rear camera modules
2
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Front cameras
Outer: 12 MP Center Stage, f/2.2. Inner: under-display FaceTime camera, f/1.8; resolution not published.
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Connections
USB-C · DisplayPort · USB 3 up to 10 Gb/s
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Wireless connectivity
Wi-Fi 7 · Bluetooth 6 · Thread
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Biometric authentication
Touch ID in the side button
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Launch operating system
iOS 27.1
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Announced
2026-09-09
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Pre-orders open
2026-10-16
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Announced availability
2026-10-23
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Apple UK reference price
£1,999
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Announced 256 GB configuration price; not a current retailer offer. · Manufacturer specification

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US specification difference
US model is also eSIM-only. The UK product identity is retained in this comparison.
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Manufacturer specification

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Outer display
5.4-inch OLED · 1398 × 2034 · 460 ppi · up to 120 Hz
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Open width
164.6 mm
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Open thickness
5.2 mm
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Outer-display video playback
44 hours
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Different mode from the 31-hour inner-display claim. · Manufacturer specification

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8K video recording
No
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Apple lists recording up to 4K at 60 fps; 8K is not included in the complete published recording specifications. · Manufacturer specification

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Published professional camera workflows
0
Conditions & context

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. · Manufacturer specification

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