In depth comparison and review of Xiaomi MI Mix 3 5G and Samsung Galaxy S21 5G. 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 | Xiaomi MI Mix 3 5G | Samsung Galaxy S21 5G |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Manufacturer Model Number | - | SM-G991U1 | |
| Form Factor | Touch slider | Touch | |
| Height | 157.89 mm | 151.7 mm | Xiaomi MI Mix 3 5G has greater height than Samsung Galaxy S21 5G. |
| Width | 74.69 mm | 71.2 mm | Xiaomi MI Mix 3 5G has greater width than Samsung Galaxy S21 5G. |
| Depth | 8.46 mm | 7.9 mm | Samsung Galaxy S21 5G is narrower than Xiaomi MI Mix 3 5G. |
| Weight | 225 g | 171 g | Samsung Galaxy S21 5G is lighter than Xiaomi MI Mix 3 5G. |
| Body Colour | Sapphire blue | Onyx black | Phantom grey | Phantom white | |
| Protection | - | Dustproof, splashproof, water-resistant | |
| Waterproof (Water-resistant) | - | Yes | Samsung Galaxy S21 5G is waterproof. |
| IP rating | - | IP68 | |
| SAR Value | 1.577 W/kg (body), 1.557 W/kg (head) | 1.58 W/kg (simultaneous), 1.11 W/kg (wireless router), 1.08 W/kg (body), 0.74 W/kg (head) | |
| Connector Type | USB Type-C - 24 pin USB-C | USB Type-C - 24 pin USB-C | |
| SIM Card Type (Size) | - | Nano SIM, Electronic SIM card (e-SIM) | |
| SIM Card Qty | Single-SIM | Dual-SIM |
| DISPLAY | Xiaomi MI Mix 3 5G | Samsung Galaxy S21 5G |
|---|
| Display Type | OLED display | OLED display | |
|---|---|---|---|
| Display Technology | AMOLED | Infinity-O Dynamic AMOLED 2X | |
| Screen Size (Display Size) | 6.39" | 6.2" | Xiaomi MI Mix 3 5G has larger screen size than Samsung Galaxy S21 5G. |
| Screen Resolution (Display Resolution) | 2340 x 1080 pixels | 2400 x 1080 pixels | Samsung Galaxy S21 5G has better screen resolution than Xiaomi MI Mix 3 5G. |
| Display Format | Full HD+ | Full HD+ | |
| Pixel Density | 403 ppi | 421 ppi | Samsung Galaxy S21 5G has better pixel density than Xiaomi MI Mix 3 5G. |
| Aspect Ratio | 19.5:9 | - | |
| Max Brightness | 600 cd/m² | - | |
| Colour Depth | - | 16.7 million colours | |
| Contrast Ratio | 60000:1 | - | |
| HDR | Yes | Yes | Both phones have HDR. |
| HDR Technology | - | HDR10+ | |
| Display Enhancement Technology | Sunlight mode | Eye Comfort Shield | |
| Display Refresh Rate | - | 120 Hz | |
| Display Features | Always-on display, Reading mode, Colour temperature adjustment, night mode | AOD(Always On Display), Video Wallpaper | |
| Display Protection (Screen Protector) | - | Corning Gorilla Glass Victus (scratch resistant glass) |
| PROCESSOR | Xiaomi MI Mix 3 5G | Samsung Galaxy S21 5G |
|---|
| Processor Type (CPU) | Qualcomm Snapdragon 855 | Qualcomm Snapdragon 888 | |
|---|---|---|---|
| Clock Speed | 2.84 GHz | 2.84 GHz | Both phones have the same clock speed. |
| Processor Core Qty | - | 8-core | |
| 64-bit Architecture | Yes | - | Xiaomi MI Mix 3 5G has 64-bit architecture. |
| Graphics System (GPU) | Qualcomm ADRENO 640 | - |
| MEMORY | Xiaomi MI Mix 3 5G | Samsung Galaxy S21 5G |
|---|
| RAM | LPDDR4X SDRAM - 6 GB | LPDDR5 SDRAM - 8 GB | Samsung Galaxy S21 5G has more RAM than Xiaomi MI Mix 3 5G. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 128 GB | 128 GB | Both phones have the same internal memory capacity. |
| User Memory | - | 101.2 GB | |
| Memory Interface | UFS 2.1 | - |
| CAMERA | Xiaomi MI Mix 3 5G | Samsung Galaxy S21 5G |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 2 | 3 | |
|---|---|---|---|
| Sensor Resolution | 12 Megapixel | 12 Megapixel | Both phones have the same camera resolution. |
| Sensor Size | - | 1/1.76" | |
| Sensor Name | Sony Exmor RS IMX363 sensor | - | |
| Lens Type | Wide-angle lens | Wide-angle lens | |
| Lens Aperture | F/1.8 | F/1.8 | Both phones have the same camera lens aperture. |
| Field of View (FoV) | - | 79 degree(s) | |
| Pixel Size | 1.4 μm | 1.8 μm | Samsung Galaxy S21 5G has larger camera pixel size than Xiaomi MI Mix 3 5G. |
| Optical Image Stabiliser (OIS) | 4-axis OIS (Optical Image Stabilisation) | Optical Image Stabiliser (OIS) | Both phones have optical image stabilization. |
| Focus Adjustment | Automatic | Automatic | |
| Laser Auto Focus | - | Yes | |
| Optical Zoom | - | 3x | |
| Digital Zoom | - | 30x | |
| Self-Timer Delay | - | Yes | |
| Special Effects | HDR | Face retouch, Grid Line | |
| HDR Mode | - | Auto HDR mode | |
| Camera Modes | Panorama, Nightscape capture mode, Personalized AI Beautify | Panorama, Slow motion mode, Pro mode, HYPERLAPSE, Super Slow-mo, Flowers, Greenery, Trees, Sky, Beaches, Watersides, Snow, Backlit, Text, Food, Face, Baby, Person, Dog, Cat, People, Sunset, Sunrise, City, Waterfall, Scenery, Stage, Vehicles, Drinks, Animal, Shoes, Indoor, Clothes, Night view, Portrait, Night, Motion Photo, Mountain, Single Take, Pro Video, Portrait video, Director's View | |
| Face Recognition (Face ID) | Face recognition | - | Xiaomi MI Mix 3 5G has face detection. |
| Light Source | Flash | High CRI LED flash | |
| Video Resolutions | 1920 x 1080 (1080p) at 30 fps, 1920 x 1080 (1080p) at 60 fps, 1280 x 720 (720p) at 30 fps, Slo-mo video 1920 x 1080 (1080p) at 120 fps, Slo-mo video 1280 x 720 (720p) at 240 fps, 3840 x 2160 (4K) at 30 fps, Slo-mo video 1280 x 720 (720p) at 120 fps, 3840 x 2160 (4K) at 60 fps, Super slow motion video 1280 x 720 (720p) at 960 fps, Slo-mo video 1920 x 1080 (1080p) at 240 fps, Super slow motion video 1920 x 1080 (1080p) at 960 fps | 1920 x 1080 (1080p) at 60 fps, 1280 x 720 (720p) at 30 fps, 3840 x 2160 (4K) at 60 fps, Super slow motion video 1280 x 720 (720p) at 960 fps, Slo-mo video 1920 x 1080 (1080p) at 240 fps, 7680 x 4320 (8K) at 24 fps, Hyperlapse 4K video support at 30 fps, Super Steady 1080p video support at 60 fps | |
| Camera Features (Functions) | AI scene and object detection, Dual Pixel Autofocus technology, AI Dual camera, 4-in-1 Super Pixel, AI scene detection, AI dynamic bokeh, AI studio lighting, AI Super Resolution, low-light enhancement technology, AI special effects | Playback zoom, Motion photo, blink detection, QR-code scanner, VDIS (Video Digital Image Stabilisation), Tracking AF, Video location tags, Scene Optimiser, Lens smudge, Flaw detection, Shot suggestions, blur detection, HDR10+ recording, Super steady, Super Speed Dual Pixel AF, Quick Measure, Zoom-In Mic, HEIF image capture, Space Zoom, Take 33MP still photos while playing 8K video, Hybrid Optic Zoom 3x, Super Resolution Zoom up to 30x, Digital zoom up to 12x for video, AR Doodle, HEVC (High Efficiency Video coding) support, Microphone Control (Pro Video only) |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 12 Megapixel | 12 Megapixel | Both phones have the same second camera resolution. |
|---|---|---|---|
| Sensor Name (2nd Camera) | Samsung S5K3M3+ | - | |
| Lens Type (2nd Camera) | - | Ultra wide-angle lens | |
| Lens Aperture (2nd Camera) | - | F/2.2 | |
| Field of View (2nd Camera) | - | 120 degree(s) | |
| Pixel Size (2nd Camera) | 1 μm | 1.4 μm | Samsung Galaxy S21 5G has larger second camera pixel size than Xiaomi MI Mix 3 5G. |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | - | 64 Megapixel | |
|---|---|---|---|
| Sensor Size (3rd Camera) | - | 1/1.72" | |
| Lens Type (3rd Camera) | - | Telephoto lens | |
| Lens Aperture (3rd Camera) | - | F/2.0 | |
| Field of View (3rd Camera) | - | 76 degree(s) | |
| Pixel Size (3rd Camera) | - | 0.8 μm | |
| Optical Image Stabiliser (OIS) | - | Optical Image Stabiliser (OIS) | Samsung Galaxy S21 5G has optical stabilisation of the third camera. |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 2 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 24 Megapixel | 10 Megapixel | Xiaomi MI Mix 3 5G has better front camera resolution than Samsung Galaxy S21 5G. |
| Sensor Name (Front) | Sony Exmor RS IMX576 sensor | - | |
| Lens Aperture (Front) | - | F/2.2 | |
| Field of View (Front) | - | 80 degree(s) | |
| Pixel Size (Front) | 1.8 μm | 1.22 μm | Xiaomi MI Mix 3 5G has larger front camera pixel size than Samsung Galaxy S21 5G. |
| Focus Adjustment | - | Automatic | |
| Special Effects (Front) | Magic mirror | - | |
| HDR Mode (Front) | Auto HDR mode | - | |
| Camera Modes (Front) | Bokeh Mode, AI Beautify, AI makeup | - | |
| Face Recognition (Face ID) | Face recognition | - | Xiaomi MI Mix 3 5G has face detection. |
| Camera Features (Front) | AI portrait mode, 4-in-1 Super Pixel technology, Video Beautify, AI scene detection, AI dynamic bokeh, AI studio lighting, AI real-time video background blurring, AI eye light | Dual Pixel AF |
| SECOND FRONT CAMERA |
|---|
| Sensor Resolution (2nd Front) | 2 Megapixel | - | |
|---|---|---|---|
| Sensor Name (2nd Front) | OC0A10 | - | |
| Pixel Size (2nd Front) | 1.75 μm | - |
| BATTERY AND CHARGING | Xiaomi MI Mix 3 5G | Samsung Galaxy S21 5G |
|---|
| Battery Capacity (Battery Size) | 3800 mAh | 4000 mAh | Samsung Galaxy S21 5G has larger battery capacity than Xiaomi MI Mix 3 5G. |
|---|---|---|---|
| Fast Charging Technology | Qualcomm Quick Charge 4.0+ | Qualcomm Quick Charge 2.0, Adaptive Fast Charging, Power Delivery 3.0 | Both phones have fast charging technology. |
| Wireless Charging | - | Yes | Samsung Galaxy S21 5G can be charged wirelessly. |
| Wireless Charging Standards | - | WPC, Qi, Fast Wireless Charging 2.0, Wireless PowerShare | |
| Talk Time | - | 1800 minutes | |
| Run Time Details | - | Talk (LTE): up to 1800 min Active online usage (LTE): up to 14 hrs Active online usage (Wi-Fi): up to 15 hrs Playback (wireless video): up to 19 hrs Playback (wireless audio): up to 72 hrs |
| CELLULAR | Xiaomi MI Mix 3 5G | Samsung Galaxy S21 5G |
|---|
| Technology | CDMA2000 1X / GSM / WCDMA (UMTS) / TD-SCDMA | CDMA2000 1X / GSM / WCDMA (UMTS) | |
|---|---|---|---|
| Mobile Broadband Generation | 5G | 5G | Both phones have the same mobile network generation. |
| Operating System | - | Android 11 | |
| Intelligent Assistant | - | Bixby | |
| Payment Technology | - | Samsung Pay | |
| Navigation | GPS, GLONASS, BeiDou, Galileo, QZSS | GPS, GLONASS, Galileo |
| COMMUNICATIONS | Xiaomi MI Mix 3 5G | Samsung Galaxy S21 5G |
|---|
| Data Transmission | GPRS, EDGE, EV-DO, HSDPA, HSUPA, HSPA+, FDD-LTE, TDD-LTE, 5G NR FR1 | FDD-LTE, TDD-LTE, 5G NR FR1, 5G NR FR2 | |
|---|---|---|---|
| 2G Band | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM, 800 CDMA2000 1X | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM, 800 CDMA2000 1X, 1900 CDMA2000 1X | |
| 3G UMTS Band | Band 1, Band 2, Band 4, Band 5, Band 8 | Band 1, Band 2, Band 4, Band 5, Band 8 | |
| 3G UMTS Frequency | 2100, 1900, 1700, 850, 900 | 2100, 1900, 1700, 850, 900 | |
| 4G LTE Band | Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 20, Band 28, Band 34, Band 38, Band 39, Band 40, Band 41 | Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 12, Band 13, Band 14, Band 18, Band 19, Band 20, Band 25, Band 26, Band 28, Band 30, Band 38, Band 39, Band 40, Band 41, 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 800 DD, FDD 700 APT, TDD 2000, TDD 2600, TDD 1900, TDD 2300, TDD 2500 | 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 lower, FDD 800 upper, FDD 800 DD, FDD 1900+, FDD 850+, FDD 700 APT, FDD 2300 WCS, TDD 2600, TDD 1900, TDD 2300, TDD 2500, TDD 5150, TDD 3600, FDD 1700 - 2110 AWS-3, FDD 600 | |
| 5G NR Band | N78 | N41, n71, n260, n261 | |
| 5G NR Frequency | TDD TD 3500 | TDD TD 2500, FDD 600, TDD 39GHz, TDD 28GHz | |
| Wireless Interface | IEEE 802.11a/b/g/n/ac | IEEE 802.11a/b/g/n/ac/ax | |
| Bluetooth | Bluetooth 5.0 | Bluetooth 5.0 | |
| NFC | Yes | Yes | Both phones have an NFC reader for mobile payments. |
| Messaging Services | SMS, MMS | - |
| MEDIA | Xiaomi MI Mix 3 5G | Samsung Galaxy S21 5G |
|---|
| Supported Digital Audio Standards | WAV, AAC, PCM, AMR, MP3, FLAC, AAC +, eAAC+, APE (Monkey's Audio), apt-X, AMR-WB, AMR-NB, apt-X HD | WAV, AAC, PCM, AMR, MP3, FLAC, XMF, OGG, MIDI, APE (Monkey's Audio), M4A, DSF, MXMF, OGA, 3GA, AWB, IMY, RTTTL, RTX, OTA, DFF, MID, DSD64, DSD128 | |
|---|---|---|---|
| Supported Digital Video Standards | MKV, VC-1, XviD, MPEG-4, H.264, M4V, HEVC, H.265, ASP | MKV, FLV, AVI, 3GP, M4V, WebM, 3G2, MP4 | |
| Sound Enhancements | - | Dolby Digital Plus sound, Dolby Atmos sound technology, Surround sound, stereo speakers tuned by AKG, Dolby Digital sound |
| FEATURES | Xiaomi MI Mix 3 5G | Samsung Galaxy S21 5G |
|---|
| 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, digital compass, gyro sensor, vibration sensor, ultrasonic distance sensor | Accelerometer, ambient light sensor, proximity sensor, barometer, gyro sensor, hall sensor, geomagnetic sensor | |
| Security Devices | Face recognition, fingerprint reader | Fingerprint reader (under display), face recognition | |
| Additional Phone Features | MIMO technology, MU-MIMO technology | MIMO technology, Screen Write, notification flashlight, Smart Select, Fast Charging, Samsung KNOX, Smart View, Live message, Screen off memo, Samsung DeX support, Bixby Vision, TalkBack, Dual Audio, Bixby Routines, Intelligent Performance Enhancer, Bixby key, Bluetooth Scalable Codec, Samsung Knox Vault, Private Share function, Enhanced Game Booster, Air Command |
| OTHERS | Xiaomi MI Mix 3 5G | Samsung Galaxy S21 5G |
|---|
| Included Accessories | Protective cover, power adapter, SIM card removal tool, USB-C cable, USB-C to 3.5 jack audio cable | SIM card removal tool, USB-C to USB-C cable | |
|---|---|---|---|
| Compliant Standards | - | VDE, IP68, HAC (Hearing Aid Compatible), SGS Eye Care Display Certification | |
| Max Depth of Water Resistance | - | 1.5 m |
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