In depth comparison and review of Samsung Galaxy A51 and Microsoft Surface Duo 2. Compare sizes, cameras, batteries, memory, and other important specifications and features to easily choose the right phone for you. Our goal is to help you uncover differences between the products and find the phone that will best fit your needs.
| DESIGN AND DIMENSIONS | Samsung Galaxy A51 | Microsoft Surface Duo 2 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Manufacturer Model Number | SM-A515F/DSN | - | |
| Form Factor | Touch | Folder - dual screen | |
| Height | 158.5 mm | 145.2 mm | Samsung Galaxy A51 has greater height than Microsoft Surface Duo 2. |
| Width | 73.6 mm | 92.1 mm | Microsoft Surface Duo 2 has greater width than Samsung Galaxy A51. |
| Depth | 7.9 mm | 11 mm | Samsung Galaxy A51 is narrower than Samsung Galaxy A51. |
| Weight | 172 g | 284 g | Samsung Galaxy A51 is lighter than Samsung Galaxy A51. |
| Dimensions Details | - | Unfolded - 184.5 mm x 5.5 mm x 145.2 mm | |
| Body Colour | Silver | Prism crush black | Haze crush silver | Prism crush blue | Prism crush white | Glacier | Obsidian | |
| Body Material | - | Corning Gorilla Glass | |
| Waterproof (Water-resistant) | - | - | |
| Repairability Index | - | 3.9 (out of 10) | |
| SAR Value | 0.369 W/kg (head), 1.59 W/kg (body), 2.93 W/kg (limb) | 0.726 W/kg (head), 1.478 W/kg (body) | |
| Connector Type | USB Type-C - 24 pin USB-C Headset jack - mini-phone 3.5mm |
USB Type-C - 24 pin USB-C | |
| SIM Card Type (Size) | Nano SIM | Nano SIM, Electronic SIM card (e-SIM) | |
| SIM Card Qty | Dual-SIM | Dual-SIM |
| DISPLAY | Samsung Galaxy A51 | Microsoft Surface Duo 2 |
|---|
| Display Type | OLED display | OLED display | |
|---|---|---|---|
| Display Technology | Super AMOLED | AMOLED | |
| Foldable Display | - | Yes | |
| Display Design | - | Both directions folding | |
| Screen Size (Display Size) | 6.5" | 5.8" | Samsung Galaxy A51 has larger screen size than Microsoft Surface Duo 2. |
| Screen Resolution (Display Resolution) | 2400 x 1080 pixels | 1344 x 1892 pixels | Samsung Galaxy A51 has better screen resolution than Microsoft Surface Duo 2. |
| Display Format | Full HD+ | - | |
| Pixel Density | 408 ppi | 401 ppi | Samsung Galaxy A51 has better pixel density than Microsoft Surface Duo 2. |
| Aspect Ratio | - | 13:9 | |
| Max Brightness | - | 800 cd/m² | |
| Colour Depth | 16.7 million colours | - | |
| HDR | - | Yes | Microsoft Surface Duo 2 has HDR. |
| Display Refresh Rate | - | 90 Hz | |
| Display Features | Edge-to-Edge screen, Infinity O display | DCI-P3 Wide colour gamut, 100% sRGB, Dual PixelSense Fusion Displays | |
| Display Protection (Screen Protector) | - | Corning Gorilla Glass Victus (scratch resistant glass) |
| SECOND DISPLAY |
|---|
| Second Display Type | - | OLED display - colour | |
|---|---|---|---|
| Second Display Screen Size | - | 5.8" | |
| Second Display Resolution | - | 1344 x 1892 pixels |
| UNFOLDED DISPLAY |
|---|
| Unfolded Display Screen Size | - | 8.3 in | |
|---|---|---|---|
| Unfolded Display Resolution | - | 2688 x 1892 pixels |
| PROCESSOR | Samsung Galaxy A51 | Microsoft Surface Duo 2 |
|---|
| Processor Type (CPU) | Samsung Exynos 9611 | Qualcomm Snapdragon 888 5G | |
|---|---|---|---|
| Clock Speed | 2.3 GHz | - | |
| Processor Core Qty | 8-core | 8-core | Both phones have the same number of phone cores. |
| 64-bit Architecture | Yes | - | Samsung Galaxy A51 has 64-bit architecture. |
| MEMORY | Samsung Galaxy A51 | Microsoft Surface Duo 2 |
|---|
| RAM | 4 GB | LPDDR5 SDRAM - 8 GB | Microsoft Surface Duo 2 has more RAM than Samsung Galaxy A51. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 128 GB | 128 GB | Both phones have the same internal memory capacity. |
| User Memory | 107 GB | - | |
| Supported Flash Memory Cards (Expandable Memory) | microSDHC, microSDXC - up to 512 GB | - |
| CAMERA | Samsung Galaxy A51 | Microsoft Surface Duo 2 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 4 | 3 | |
|---|---|---|---|
| Sensor Resolution | 48 Megapixel | 12 Megapixel | Samsung Galaxy A51 has better camera resolution than Microsoft Surface Duo 2. |
| Lens Aperture | F/2.0 | F/1.7 | Microsoft Surface Duo 2 has better lens aperture than Samsung Galaxy A51. |
| Pixel Size | - | 1.4 μm | |
| Optical Image Stabiliser (OIS) | - | Optical Image Stabiliser (OIS) | Microsoft Surface Duo 2 has optical stabilisation. |
| Focus Adjustment | Automatic | - | |
| Digital Zoom | 8x | 10x | Microsoft Surface Duo 2 has better digital zoom than Samsung Galaxy A51. |
| Special Effects | - | HDR | |
| Camera Modes | Slow motion mode, Live Focus mode | Night mode, Auto mode, low-light shots, Panorama mode with wide dynamic range, slow motion video at 120 or 240fps | |
| Light Source | LED flash | Dual LED flash | |
| Video Resolutions | Slo-mo video 1280 x 720 (720p) at 240 fps, 3840 x 2160 (4K) at 30 fps | 1920 x 1080 (1080p) at 30 fps, 1920 x 1080 (1080p) at 60 fps, 3840 x 2160 (4K) at 30 fps, 3840 x 2160 (4K) at 60 fps | |
| Camera Features (Functions) | AR sticker, background blur, Scene Optimiser, Eye blink, Flaw detection, Stamp, Facial blur | Dual Pixel Phase Detect Auto-Focus (PDAF), Smooth Zoom, HEVC (High Efficiency Video coding), HDR video recording, multi-frame photo capture, dynamic range scene detection |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 12 Megapixel | 12 Megapixel | Both phones have the same second camera resolution. |
|---|---|---|---|
| Lens Type (2nd Camera) | Ultra wide-angle lens | Telephoto lens | |
| Lens Aperture (2nd Camera) | F/2.2 | F/2.4 | Samsung Galaxy A51 has better second camera lens aperture than Samsung Galaxy A51. |
| Field of View (2nd Camera) | 123 degree(s) | - | |
| Pixel Size (2nd Camera) | - | 1 μm | |
| Optical Image Stabiliser (OIS) | - | Optical Image Stabiliser (OIS) | Microsoft Surface Duo 2 has optical stabilisation of the second camera. |
| Optical Zoom | - | 2x | |
| Camera Features (2nd Camera) | - | Phase Detect Auto-Focus (PDAF) |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | 5 Megapixel | 16 Megapixel | Microsoft Surface Duo 2 has higher resolution third camera than Samsung Galaxy A51. |
|---|---|---|---|
| Lens Type (3rd Camera) | - | Ultra wide-angle lens | |
| Lens Aperture (3rd Camera) | F/2.4 | F/2.2 | Microsoft Surface Duo 2 has better third camera lens aperture than Samsung Galaxy A51. |
| Field of View (3rd Camera) | - | 110 degree(s) | |
| Pixel Size (3rd Camera) | - | 1 μm | |
| Camera Functions (3rd Camera) | Macro camera | - | |
| Camera Features (3rd Camera) | - | Field of view, distortion correction |
| FOURTH CAMERA |
|---|
| Sensor Resolution (4th Camera) | 5 Megapixel | - | |
|---|---|---|---|
| Lens Type (4th Camera) | Telephoto lens | - | |
| Lens Aperture (4th Camera) | F/2.2 | - | |
| Camera Functions (4th Camera) | Depth camera | - |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 1 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 32 Megapixel | 12 Megapixel | Samsung Galaxy A51 has better front camera resolution than Microsoft Surface Duo 2. |
| Lens Aperture (Front) | F/2.2 | F/2.0 | Microsoft Surface Duo 2 has better front lens aperture than Samsung Galaxy A51. |
| Pixel Size (Front) | - | 1 μm | |
| Focus Adjustment | Focus free | - |
| BATTERY AND CHARGING | Samsung Galaxy A51 | Microsoft Surface Duo 2 |
|---|
| Battery Capacity (Battery Size) | 4000 mAh | 4449 mAh | Microsoft Surface Duo 2 has larger battery capacity than Samsung Galaxy A51. |
|---|---|---|---|
| Talk Time | 1920 minutes | 1680 minutes | Samsung Galaxy A51 has longer battery life when making calls than Microsoft Surface Duo 2. |
| Run Time Details | Active online usage (LTE): up to 15 hrs Active online usage (Wi-Fi): up to 16 hrs Playback (video): up to 20 hrs Playback (audio): up to 87 hrs Talk (4G): up to 1920 min |
Talk: up to 1680 min Playback (local video): up to 15.5 hrs |
|
| Battery Technology | Lithium Ion | - |
| CELLULAR | Samsung Galaxy A51 | Microsoft Surface Duo 2 |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 4G | 5G | Microsoft Surface Duo 2 has more advanced generation mobile network. |
| Operating System | Android 10 | Android 11 | |
| User Interface | One UI | - | |
| Intelligent Assistant | Bixby | Google Assistant | |
| Navigation | GPS, GLONASS, BeiDou, Galileo | GPS, GLONASS, BeiDou, Galileo, QZSS |
| COMMUNICATIONS | Samsung Galaxy A51 | Microsoft Surface Duo 2 |
|---|
| Data Transmission | GPRS, EDGE, HSDPA, HSUPA, HSPA+, FDD-LTE, TDD-LTE | GPRS, FDD-LTE, TDD-LTE, Gigabit LTE, LAA, 5G NR FR1 | |
|---|---|---|---|
| 2G Band | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | |
| 3G UMTS Band | Band 1, Band 2, Band 4, Band 5, Band 8 | Band 1, Band 2, Band 5, Band 8 | |
| 3G UMTS Frequency | 2100, 1900, 1700, 850, 900 | 2100, 1900, 850, 900 | |
| 4G LTE Band | Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 12, Band 13, Band 17, Band 20, Band 26, Band 28, Band 38, Band 40, Band 41, Band 66 | Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 12, Band 13, Band 14, Band 19, Band 20, Band 25, Band 26, Band 28, Band 29, Band 30, Band 38, Band 39, Band 40, Band 41, Band 42, Band 46, Band 48, Band 66, Band 71 | |
| 4G LTE Frequency | FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 700a, FDD 700c, FDD 700b, FDD 800 DD, FDD 850+, FDD 700 APT, TDD 2600, TDD 2300, TDD 2500, FDD 1700 - 2110 AWS-3 | FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 700a, FDD 700c, FDD 700 PS, FDD 800 upper, FDD 800 DD, FDD 1900+, FDD 850+, FDD 700 APT, FDD 700d, FDD 2300 WCS, TDD 2600, TDD 1900, TDD 2300, TDD 2500, TDD 3500, TDD 5150, TDD 3600, FDD 1700 - 2110 AWS-3, FDD 600 | |
| 5G NR Band | - | N1, n2, n3, n5, n7, n20, n28, n38, n41, n66, n71, n77, n78, n79, n25 | |
| 5G NR Frequency | - | FDD 2100, FDD 1900PCS, FDD 1800, FDD 850, FDD 2600, FDD 800, FDD 700APT, TDD TD 2600, TDD TD 2500, FDD AWS-3, FDD 600, TDD TD 3700, TDD TD 3500, TDD TD 4500, FDD 1900 | |
| Wireless Interface | IEEE 802.11a/b/g/n/ac, ANT+ | IEEE 802.11ax | |
| Bluetooth | Bluetooth 5.0 LE | Bluetooth 5.1 | |
| Bluetooth Profiles | HFP, HSP, OPP, PAN, A2DP, AVRCP, HID, SAP, PBAP, MAP, HOGP | - | |
| NFC | Yes | Yes | Both phones have an NFC reader for mobile payments. |
| Messaging Services | SMS, MMS | - |
| MEDIA | Samsung Galaxy A51 | Microsoft Surface Duo 2 |
|---|
| Supported Digital Audio Standards | WAV, WMA, AAC, AMR, MP3, FLAC, XMF, OGG, MIDI, M4A, MXMF, OGA, 3GA, AWB, IMY, RTTTL, RTX, OTA, MID | WAV, AAC, AMR, MP3, FLAC, OGG, MIDI, M4A, apt-X, IMY, RTX, OTA, MID, TWS, RTTL | |
|---|---|---|---|
| Supported Digital Video Standards | MKV, FLV, AVI, WMV, ASF, 3GP, M4V, WebM, 3G2, MP4 | MKV, FLV, AVI, MOV, MPEG-4, WMV, ASF, 3GP, H.264, TS, M2TS, WebM, HEVC, 3G2, HEIF, H.265 HEVC, HEIC | |
| Sound Enhancements | - | Qualcomm aptX HD audio, Qualcomm aptX Classic |
| FEATURES | Samsung Galaxy A51 | Microsoft Surface Duo 2 |
|---|
| Phone Functions | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | |
|---|---|---|---|
| Sensors | Accelerometer, ambient light sensor, proximity sensor, gyro sensor, hall sensor, geomagnetic sensor | Hall sensor, Time of Flight (ToF), dual accelerometers, dual gyroscope, dual magnetometer, dual ambient light sensor, dual proximity sensor | |
| Security Devices | Fingerprint reader (under display) | Fingerprint reader (side) | |
| Additional Phone Features | Fast Charging, Samsung KNOX, Bixby Vision, Game Booster, Bixby Routines | MIMO technology, Fast Charging, dual battery, Full Duplex communication, dual microphones with AI-based noise suppression and acoustic echo cancellation |
| OTHERS | Samsung Galaxy A51 | Microsoft Surface Duo 2 |
|---|
| Included Accessories | Power adapter | SIM card removal tool, USB-C headset, Surface Duo 2 USB-C cable | |
|---|---|---|---|
| Compliant Standards | - | HEARING AID M4/T3 |
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