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- 256 GB
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Overview
iPhone Duo is Apple's first foldable iPhone. It pairs a 7.6-inch Super Retina XDR folding inner display with a 5.4-inch outer display in a titanium body that measures 5.2 mm thick when open. This US configuration (MK1F4LL/A) has 256GB of storage in Night Sky. It runs on the A20 Pro chip and connects over 5G sub-6 GHz and mmWave through the Apple C2 modem, with Wi-Fi 7 and dual eSIM.
- First foldable iPhone: 7.6-inch Super Retina XDR inner folding display and 5.4-inch outer display, both with ProMotion up to 120Hz
- A20 Pro chip with 6-core CPU, 7-core GPU with Neural Accelerators and dual 16-core Neural Engine
- Apple C2 modem with 5G sub-6 GHz and mmWave (4x4 MIMO) and Gigabit LTE
- 48MP Dual Fusion camera system with 48MP Fusion Main and 48MP Fusion Ultra Wide, plus a 12MP optical-quality 2x Telephoto option
- Titanium foldable design, 5.2 mm thick unfolded, IP68 rated to 6 meters for up to 30 minutes
- Dual eSIM, Wi-Fi 7, Bluetooth 6, Thread and satellite safety and messaging features
- Up to 24 hours typical use from dual batteries; 25W MagSafe and Qi2 wireless charging
- Review documents, dashboards and video calls on a 7.6-inch screen that folds to 84.1 mm wide for the pocket
iPhone Duo is Apple's first foldable iPhone. Open, it has the largest and thinnest iPhone display to date. Apple rates the 7.6-inch inner display as 50 percent larger than iPhone 18 Pro Max. The 5.4-inch outer display offers more than 90 percent of the screen area of iPhone 18 Pro. This part number, MK1F4LL/A, is the US-market 256GB model in Night Sky. It suits executives, field leads and prosumers who want tablet-size working space in a phone that folds to 84.1 mm wide.
Both screens are Super Retina XDR OLED panels with ProMotion up to 120Hz. They reach up to 3000 nits peak brightness outdoors. The inner display uses a nano-texture finish to reduce glare and hides an under-display FaceTime camera, and it supports Apple Pencil (USB-C). The A20 Pro chip has a 6-core CPU, a 7-core GPU with Neural Accelerators and a dual 16-core Neural Engine to power Apple Intelligence. The body is rated IP68 to 6 meters for up to 30 minutes, with a Ceramic Shield 2 front.
For connectivity, the Apple C2 modem covers 5G sub-6 GHz and mmWave with 4x4 MIMO, plus Gigabit LTE. The Apple N1 chip adds Wi-Fi 7, Bluetooth 6 and Thread. The phone uses dual eSIM only, with two active lines and storage for eight or more eSIMs. It does not accept physical SIM cards. Satellite features cover Emergency SOS, Messages, Roadside Assistance and Find My.
Dual lithium-ion batteries are rated for up to 24 hours of typical use. Fast charging reaches 50 percent in around 20 minutes with a 60W or higher USB-C adapter, sold separately. MagSafe and Qi2 wireless charging run at up to 25W. The box contains the iPhone with iOS 27 and a 1 m USB-C Charge Cable.
Ideal for
- Executives and managers reviewing documents, spreadsheets and dashboards on a 7.6-inch screen away from the desk
- Field-operations leads who need 5G mmWave and sub-6 GHz coverage plus satellite messaging and Emergency SOS
- Business users running separate work and personal lines on dual eSIM
- Mobile presenters driving external displays up to 4K HDR over USB-C DisplayPort
- Content creators capturing 4K Dolby Vision video at up to 120 fps
Specifications
Chip
- CPU
- 6-core CPU (2 super cores, 4 efficiency cores)
- Gpu
- 7-core GPU with Neural Accelerators
- Processor
- A20 Pro chip
- Ray Tracing
- Hardware-accelerated ray tracing
- Neural Engine
- Dual 16-core Neural Engine
Siri
- Features
- Hands-free "Siri" / "Hey Siri"; Type to Siri; powered by Apple Intelligence
Camera
- Zoom
- 2x optical-quality zoom in, 2x optical zoom out; 4x optical-quality zoom range; digital zoom up to 10x
- Macro
- 48MP macro photography
- System
- 48MP Dual Fusion camera system
- Features
- Smart Take; Duo Preview; Photographic Styles 3; Smart focus tracking; Customizable default lens; Sapphire crystal lens cover; True Tone flash; Photonic Engine; Deep Fusion; Smart HDR 5; Next-generation portraits; Portrait Lighting (six effects); Night mode; Wide color capture; Lens correction; Advanced red-eye correction; Auto image stabilization; Burst mode; Photo geotagging
- Panorama
- Panorama (up to 63MP)
- Fusion Main
- 26 mm, ƒ/1.6, sensor-shift optical image stabilization, Hybrid Focus Pixels, super-high-resolution photos (24MP and 48MP)
- Telephoto 2x
- 12MP optical-quality 2x Telephoto: 52 mm, ƒ/1.6, sensor-shift optical image stabilization, Hybrid Focus Pixels
- Image Formats
- HEIF and JPEG
- Fusion Ultra Wide
- 13 mm, ƒ/2.2, 120° field of view, Hybrid Focus Pixels, super-high-resolution photos (24MP and 48MP)
Finish
- Back
- Ceramic Shield back
- Front
- Ceramic Shield 2 front
- Design
- Titanium foldable design
- Available Colors
- Night Sky, Star White
Package
- Shipping Weight
- 0.98 lb
Privacy
- Details
- Secure authentication; App Tracking permission; end-to-end encrypted iMessage and FaceTime
Sensors
- Sensors
- Touch ID fingerprint sensor; Barometer; High dynamic range gyro; High-g accelerometer; Proximity sensor; Four ambient light sensors
Capacity
- Available Capacities
- 256GB; 512GB; 1TB; 2TB
Displays
- Coatings
- Fingerprint-resistant oleophobic coating; Anti-reflective coating
- Apple Pencil
- Supports Apple Pencil (USB-C)
- Contrast Ratio
- 2,000,000:1 contrast ratio (typical)
- Display Features
- Dynamic Island; Always-On display; ProMotion up to 120Hz; HDR display; True Tone; Wide color (P3); Haptic Touch
- Inner Display Size
- 7.6-inch (diagonal)
- Inner Display Type
- Super Retina XDR all-screen OLED folding display
- Minimum Brightness
- 1 nit minimum brightness
- Outer Display Size
- 5.4-inch (diagonal)
- Outer Display Type
- Super Retina XDR all-screen OLED display
- Peak Brightness Hdr
- 1600 nits peak brightness (HDR)
- Inner Display Finish
- Nano-texture finish; Wide-angle OLEDs
- Multilingual Display
- Multiple languages and characters displayed simultaneously
- Max Brightness Typical
- 1000 nits max brightness (typical)
- Peak Brightness Outdoor
- 3000 nits peak brightness (outdoor)
- Rectangular Measurement
- 7.58 and 5.36 inches diagonally when measured as standard rectangles (actual viewable area is less)
- Inner Display Resolution
- 1878-by-2670-pixel resolution at 430 ppi
- Outer Display Resolution
- 1398-by-2034-pixel resolution at 460 ppi
Location
- GNSS
- Precision dual-frequency GPS (GPS, GLONASS, Galileo, QZSS, BeiDou, and NavIC)
- Other
- Digital compass; Wi-Fi; Cellular; iBeacon microlocation
SIM Card
- SIM
- Dual eSIM (two active eSIMs; stores eight or more eSIMs)
- Physical SIM
- Not compatible with physical SIM cards
Touch ID
- Fingerprint Sensor
- Fingerprint sensor built into the side button
Apple Pay
- Features
- Touch ID payments in stores, apps and web; Apple Cash in Messages; Mac purchase completion; Express Transit
Languages
- Supported
- English, Chinese, French, German, Italian, Japanese, Korean, Spanish, Arabic and 26 more languages
Apple Card
- Details
- Apple Card: 3% / 2% / 1% Daily Cash; managed in Wallet; titanium physical card; Family Sharing for up to five people (13+)
IN The Box
- Contents
- iPhone with iOS 27; USB-C Charge Cable (1 m)
Front Camera
- Inner Video
- 1080p video recording at 30 or 60 fps; QuickTake video at 1080p 30 and 60 fps
- Outer Video
- 4K Dolby Vision at 24/25/30/60 fps; 1080p Dolby Vision at 25/30/60 fps; Cinematic mode up to 4K Dolby Vision at 30 fps; Slo-mo 1080p at 120 fps; QuickTake up to 4K 60 fps Dolby Vision
- Inner Camera
- Under-display FaceTime camera, ƒ/1.8 aperture
- Outer Camera
- 12MP Center Stage camera, ƒ/2.2 aperture
- Inner Features
- Center Stage for video calls; Tap to zoom and rotate; Ultra-stabilized video; Animoji and Memoji in FaceTime; Wide color capture; Lens correction; Auto image stabilization; Spatial Audio and stereo recording; Wind noise reduction; Audio Mix
- Outer Features
- Retina Flash; Smart Take; Kid Cue; Photographic Styles 3; Center Stage for photos and video calls; Ultra-stabilized video; Dual Capture; Photonic Engine; Deep Fusion; Smart HDR 5; Portraits; Portrait Lighting; Animoji and Memoji; Night mode; Stabilized time-lapse; Night mode Time-lapse; Spatial Audio; Wind noise reduction; Audio Mix
Accessibility
- Features
- Assistive Access; VoiceOver; Zoom; Magnifier; Voice Control; Switch Control; AssistiveTouch; Eye Tracking; RTT/TTY; Closed Captions; Live Captions; Personal Voice; Live Speech; Type to Siri; Vocal Shortcuts; Spoken Content
Audio Calling
- Features
- FaceTime audio; VoLTE; Wi-Fi calling; SharePlay; Screen sharing; Spatial Audio; Voice Isolation and Wide Spectrum microphone modes
Peace OF Mind
- Safety Features
- Emergency SOS via satellite; Crash Detection; Roadside Assistance via satellite; Messages via satellite; Find My via satellite
Video Calling
- Features
- FaceTime HD (1080p) over 5G or Wi-Fi; Center Stage; Duo FaceTime; SharePlay; Screen sharing; Portrait mode; Spatial Audio; Voice Isolation and Wide Spectrum; rear-camera zoom
Audio Playback
- Formats
- AAC, APAC, MP3, Apple Lossless, FLAC, Dolby Digital, Dolby Digital Plus, Dolby Atmos
- Features
- Spatial Audio playback; User-configurable maximum volume limit
Video Playback
- Hdr
- HDR with Dolby Vision, HDR10+/HDR10, and HLG
- Airplay
- Up to 4K HDR AirPlay for mirroring, photos and video out to Apple TV (2nd gen or later) or AirPlay-enabled smart TV
- Formats
- HEVC, H.264, AV1
- Video Out
- Up to 4K HDR through native DisplayPort over USB-C or USB-C Digital AV Adapter (A2119, sold separately)
Size And Weight
- Folded Depth
- 0.44 inch (11.3 mm)
- Folded Width
- 3.31 inches (84.1 mm)
- Folded Height
- 4.64 inches (117.8 mm)
- Folded Weight
- 8.96 ounces (254 grams)
- Unfolded Depth
- 0.21 inch (5.2 mm)
- Unfolded Width
- 6.48 inches (164.6 mm)
- Unfolded Height
- 4.64 inches (117.8 mm)
- Unfolded Weight
- 8.96 ounces (254 grams)
Video Recording
- Slo MO
- Slo-mo 1080p up to 240 fps; 4K Dolby Vision up to 120 fps (Fusion Main)
- Features
- Duo Preview; Smart focus tracking; Improved low-light 1080p; Macro video incl. slo-mo and time-lapse; Stabilized time-lapse up to 4K Dolby Vision; Night mode Time-lapse; Sensor-shift OIS (Fusion Main); Audio zoom; True Tone flash; Cinematic video stabilization; Continuous autofocus; Playback zoom; Spatial Audio and stereo recording; Wind noise reduction; Audio Mix
- Video 4k
- 4K Dolby Vision at 24, 25, 30, 60, 100 fps (Fusion Main) or 120 fps (Fusion Main)
- Quicktake
- QuickTake video up to 4K Dolby Vision at 60 fps
- Video 720p
- 720p Dolby Vision at 30 fps
- Action Mode
- Action mode up to 2.8K Dolby Vision at 60 fps
- Video 1080p
- 1080p Dolby Vision at 25, 30, 60 or 120 fps (Fusion Main)
- Digital Zoom
- Digital zoom up to 6x
- Dual Capture
- Dual Capture up to 4K Dolby Vision at 30 fps
- Video Formats
- HEVC and H.264
- Cinematic Mode
- Cinematic mode up to 4K Dolby Vision at 60 fps; Cinematic mode effects from video (Fusion Main)
- Stills While Recording
- Take 8MP still photos while recording 4K video
Operating System
- OS
- iOS 27
Power And Battery
- Typical Use
- Up to 24 hours typical use
- Battery Type
- Dual built-in rechargeable lithium-ion batteries
- Video Playback
- Up to 44 hours (outer display); up to 31 hours (inner display)
- Fast Charge Wired
- Up to 50% in around 20 minutes with a 60W-capable or higher adapter (available separately) and USB-C charging cable
- Fast Charge Magsafe
- Up to 50% in around 30 minutes with a 35W or higher adapter and MagSafe Charger (both available separately)
- Video Playback Streamed
- Up to 37 hours (outer display); up to 26 hours (inner display)
This Configuration
- MPN
- MK1F4LL/A
- UPC
- 195951405452
- Brand
- Apple
- Color
- Night Sky
- Market
- United States (LL/A)
- Capacity
- 256GB
- Listing Name
- iPhone Duo 256GB Night Sky
- Model Family
- iPhone Duo
System Requirements
- Requirements
- Apple Account; Internet access; macOS 10.15+ (Finder), macOS 10.13–10.14.6 (iTunes 12.8+), or Windows 10+ (iTunes 12.12.10+)
Cellular And Wireless
- 5G
- 5G (sub-6 GHz and mmWave) with 4x4 MIMO
- LTE
- Gigabit LTE with 4x4 MIMO
- NFC
- NFC with reader mode; Express Cards with power reserve
- Wi-Fi
- Wi-Fi 7 (802.11be) with 2x2 MIMO
- Model
- Model A3447
- Thread
- Thread networking technology
- Fdd LTE
- FDD-LTE Bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 18, 19, 20, 25, 26, 28, 29, 30, 32, 66, 71, 106
- Tdd LTE
- TDD-LTE Bands 34, 38, 39, 40, 41, 42, 48, 53
- Gsm Edge
- GSM/EDGE 850, 900, 1800, 1900 MHz
- Bluetooth
- Bluetooth 6
- Fdd 5G NR
- FDD-5G NR Bands n1, n2, n3, n5, n7, n8, n12, n14, n20, n25, n26, n28, n29, n30, n66, n70, n71, n75
- Tdd 5G NR
- TDD-5G NR Bands n38, n40, n41, n48, n53, n77, n78, n79
- Umts Hspa
- UMTS/HSPA+ 850, 900, 1700/2100, 1900, 2100 MHz
- 5G NR Mmwave
- 5G NR mmWave Bands n258, n260, n261
- Wireless Chip
- Apple N1 wireless networking chip
- Cellular Modem
- Apple C2 cellular modem
- Ultra Wideband
- Apple second-generation Ultra Wideband chip
Charging And Expansion
- Connector
- USB-C connector
- USB C Support
- Charging; DisplayPort; USB 3 (up to 10Gb/s)
Rating For Hearing Aids
- Rating
- Hearing Aid Compatible
Environmental Requirements
- Altitude
- Tested up to 10,000 feet (3000 m)
- Relative Humidity
- 5% to 95% noncondensing
- Operating Temperature
- 32° to 95° F (0° to 35° C)
- Nonoperating Temperature
- −4° to 113° F (−20° to 45° C)
Splash Water Dust Resistance
- Rating
- IP68 (maximum depth of 6 meters up to 30 minutes) under IEC standard 60529
Magsafe And Wireless Charging
- Qi2
- Qi2 wireless charging up to 25W
- Other
- Magnet array; Alignment magnet; Accessory Identification NFC; Magnetometer
- Magsafe
- MagSafe wireless charging up to 25W
Apple Intelligence And Siri AI
- Details
- Apple Intelligence with Siri AI
External Buttons And Connectors
- Controls
- Exposure, Depth, Zoom, Cameras, Styles, Tone
Questions buyers ask
How big are the iPhone Duo displays?
The inner folding display is a 7.6-inch Super Retina XDR OLED at 1878 by 2670 pixels. The outer display is 5.4 inches at 1398 by 2034 pixels. Both support ProMotion up to 120Hz.
Does iPhone Duo take a physical SIM card?
No. iPhone Duo uses dual eSIM. It supports two active eSIMs and stores eight or more, and it is not compatible with physical SIM cards.
Does iPhone Duo support 5G mmWave?
Yes. The Apple C2 modem supports 5G sub-6 GHz and mmWave, on bands n258, n260 and n261, with 4x4 MIMO. It also supports Gigabit LTE.
What is the battery life?
Apple rates it at up to 24 hours of typical use. Video playback runs up to 44 hours on the outer display and up to 31 hours on the inner display.
What comes in the box?
The iPhone Duo with iOS 27 and a 1 m USB-C Charge Cable. Power adapters are available separately.
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