In depth comparison and review of Samsung Galaxy S21 Ultra 5G and Motorola Moto G31. 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 S21 Ultra 5G | Motorola Moto G31 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Manufacturer Model Number | SM-G998B/DS | - | |
| Form Factor | Touch | Touch | |
| Height | 161.5 mm | 161.89 mm | Motorola Moto G31 has greater height than Samsung Galaxy S21 Ultra 5G. |
| Width | 75.6 mm | 73.87 mm | Samsung Galaxy S21 Ultra 5G has greater width than Motorola Moto G31. |
| Depth | 8.9 mm | 8.55 mm | Motorola Moto G31 is narrower than Samsung Galaxy S21 Ultra 5G. |
| Weight | 227 g | 181 g | Motorola Moto G31 is lighter than Samsung Galaxy S21 Ultra 5G. |
| Body Colour | Phantom silver | Phantom black | Phantom navy | Phantom brown | Phantom titanium | Mineral grey | Baby blue | |
| Body Material | - | Plastic | |
| Protection | Dustproof, splashproof, water-resistant | - | |
| Waterproof (Water-resistant) | Yes | - | Samsung Galaxy S21 Ultra 5G is waterproof. |
| IP rating | IP68 | - | |
| SAR Value | 1.58 W/kg (body), 0.714 W/kg (head), 2.56 W/kg (limb) | 1.46 W/kg (body), 0.67 W/kg (head) | |
| Connector Type | USB Type-C - 24 pin USB-C | USB Type-C - 24 pin USB-C Headset jack - mini-phone 3.5mm |
|
| SIM Card Type (Size) | Nano SIM, Electronic SIM card (e-SIM) | Nano SIM | |
| SIM Card Qty | Dual-SIM | Dual-SIM | |
| SIM Card Configuration Details | - | Nano SIM + nano SIM/microSD |
| DISPLAY | Samsung Galaxy S21 Ultra 5G | Motorola Moto G31 |
|---|
| Display Type | OLED display | OLED display | |
|---|---|---|---|
| Display Technology | Infinity-O Dynamic AMOLED 2X | OLED | |
| Screen Size (Display Size) | 6.8" | 6.4" | Samsung Galaxy S21 Ultra 5G has larger screen size than Motorola Moto G31. |
| Screen Resolution (Display Resolution) | 3200 x 1440 pixels | 2400 x 1080 pixels | Samsung Galaxy S21 Ultra 5G has better screen resolution than Motorola Moto G31. |
| Display Format | QHD+ | Full HD+ | |
| Pixel Density | 515 ppi | 409 ppi | Samsung Galaxy S21 Ultra 5G has better pixel density than Motorola Moto G31. |
| Aspect Ratio | - | 20:9 | |
| Colour Depth | 16.7 million colours | - | |
| HDR | Yes | - | Samsung Galaxy S21 Ultra 5G has HDR. |
| HDR Technology | HDR10+ | - | |
| Display Enhancement Technology | Eye Comfort Shield | - | |
| Display Refresh Rate | 120 Hz | 60 Hz | Samsung Galaxy S21 Ultra 5G has better refresh rate than Motorola Moto G31. |
| Display Features | Edge Screen, AOD(Always On Display) | Max Vision display | |
| Display Protection (Screen Protector) | Corning Gorilla Glass Victus (scratch resistant glass) | - |
| PROCESSOR | Samsung Galaxy S21 Ultra 5G | Motorola Moto G31 |
|---|
| Processor Type (CPU) | Samsung Exynos 2100 | MediaTek Helio G85 | |
|---|---|---|---|
| Clock Speed | 2.9 GHz | 2 GHz | Samsung Galaxy S21 Ultra 5G has higher clock speed than Motorola Moto G31. |
| Processor Core Qty | 8-core | 8-core | Both phones have the same number of phone cores. |
| Graphics System (GPU) | Mali-G78 MP14 | ARM Mali-G52 MC2 |
| MEMORY | Samsung Galaxy S21 Ultra 5G | Motorola Moto G31 |
|---|
| RAM | LPDDR5 SDRAM - 12 GB | 4 GB | Samsung Galaxy S21 Ultra 5G has more RAM than Motorola Moto G31. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 128 GB | 64 GB | Samsung Galaxy S21 Ultra 5G has more internal memory than Motorola Moto G31. |
| User Memory | 101.7 GB | - | |
| Supported Flash Memory Cards (Expandable Memory) | - | microSDHC, microSD, microSDXC - up to 1 TB |
| CAMERA | Samsung Galaxy S21 Ultra 5G | Motorola Moto G31 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 4 | 4 | |
|---|---|---|---|
| Sensor Resolution | 12 Megapixel | 50 Megapixel | Motorola Moto G31 has better camera resolution than Samsung Galaxy S21 Ultra 5G. |
| Lens Type | Ultra wide-angle lens | - | |
| Lens Aperture | F/2.2 | F/1.8 | Motorola Moto G31 has better lens aperture than Samsung Galaxy S21 Ultra 5G. |
| Field of View (FoV) | 120 degree(s) | - | |
| Pixel Size | 1.4 μm | 1.28 μm | Samsung Galaxy S21 Ultra 5G has larger camera pixel size than Motorola Moto G31. |
| Optical Image Stabiliser (OIS) | Optical Image Stabiliser (OIS) | - | Samsung Galaxy S21 Ultra 5G has optical stabilisation. |
| Focus Adjustment | Automatic | Automatic | |
| Laser Auto Focus | Yes | - | |
| Optical Zoom | 3x | - | |
| Digital Zoom | 100x | - | |
| Self-Timer Delay | Yes | Yes | |
| Special Effects | Face retouch, Grid Line | HDR, Spot Colour | |
| HDR Mode | Auto HDR mode | - | |
| Camera Modes | 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, Night, Motion Photo, Mountain, Single Take, Pro Video, Director's View | Panorama, Pro mode, Timer mode, BurstShot, Watermark mode, Active photos, Cinemagraph, Portrait, Night Vision, AR stickers, Levelling, Macro Vision, Long exposure mode, Live filter, Capture Dual | |
| Face Recognition (Face ID) | - | Auto smile capture | Motorola Moto G31 has face detection. |
| Light Source | High CRI LED flash | LED flash | |
| Video Resolutions | 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 (UHD 8K) at 24fps, Hyperlapse 4K video support at 30 fps, Super Steady 1080p video support at 60 fps | 1920 x 1080 (1080p) at 30 fps, 1280 x 720 (720p) at 30 fps | |
| Camera Features (Functions) | Playback zoom, blink detection, VDIS (Video Digital Image Stabilisation), Tracking AF, Video location tags, Scene Optimiser, Flaw detection, Shot suggestions, blur detection, HDR10+ recording, Super steady, Quick Measure, Zoom-In Mic, 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 | Phase Detect Auto-Focus (PDAF), Barcode Scanner, Cutout, Quad Pixel technology, smart composition, RAW photo output, shot optimisation, Google Lens, High-res digital zoom (up to 8x), Assistive Grid |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 108 Megapixel | 8 Megapixel | Samsung Galaxy S21 Ultra 5G has better second camera resolution than Motorola Moto G31. |
|---|---|---|---|
| Sensor Size (2nd Camera) | 1/1.33" | - | |
| Lens Type (2nd Camera) | Wide-angle lens | Ultra wide-angle lens | |
| Lens Aperture (2nd Camera) | F/1.8 | F/2.2 | Samsung Galaxy S21 Ultra 5G has better second camera lens aperture than Samsung Galaxy S21 Ultra 5G. |
| Field of View (2nd Camera) | 83 degree(s) | 118 degree(s) | Motorola Moto G31 has larger second camera lens field of view than Samsung Galaxy S21 Ultra 5G. |
| Pixel Size (2nd Camera) | 0.8 μm | 1.12 μm | Motorola Moto G31 has larger second camera pixel size than Samsung Galaxy S21 Ultra 5G. |
| Camera Functions (2nd Camera) | - | Depth camera | |
| Camera Features (2nd Camera) | Phase Detect Auto-Focus (PDAF), OIS (Optical Image Stabilisation) | - |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | 10 Megapixel | 2 Megapixel | Samsung Galaxy S21 Ultra 5G has higher resolution third camera than Motorola Moto G31. |
|---|---|---|---|
| Lens Type (3rd Camera) | Telephoto lens | - | |
| Lens Aperture (3rd Camera) | F/2.4 | F/2.4 | Both phones have the same lens aperture of the third camera. |
| Field of View (3rd Camera) | 35 degree(s) | - | |
| Pixel Size (3rd Camera) | 1.22 μm | 1.75 μm | Motorola Moto G31 has larger third camera pixel size than Samsung Galaxy S21 Ultra 5G. |
| Camera Functions (3rd Camera) | - | Macro camera | |
| Camera Features (3rd Camera) | Dual Pixel AF | - |
| FOURTH CAMERA |
|---|
| Sensor Resolution (4th Camera) | 10 Megapixel | - | |
|---|---|---|---|
| Lens Type (4th Camera) | Telephoto lens | - | |
| Lens Aperture (4th Camera) | F/4.9 | F/2.4 | Motorola Moto G31 has better fourth camera lens aperture than Samsung Galaxy S21 Ultra 5G. |
| Field of View (4th Camera) | 10 degree(s) | - | |
| Pixel Size (4th Camera) | 1.22 μm | 1.75 μm | Motorola Moto G31 has larger fourth camera pixel size than Samsung Galaxy S21 Ultra 5G. |
| Camera Functions (4th Camera) | - | Depth camera | |
| Camera Features (4th Camera) | Dual Pixel AF | - |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 1 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 40 Megapixels | 13 Megapixel | Samsung Galaxy S21 Ultra 5G has better front camera resolution than Motorola Moto G31. |
| Lens Aperture (Front) | F/2.2 | F/2.2 | Both phones have the same front camera lens aperture. |
| Field of View (Front) | 80 degree(s) | - | |
| Pixel Size (Front) | 0.7 μm | 1.12 μm | Motorola Moto G31 has larger front camera pixel size than Samsung Galaxy S21 Ultra 5G. |
| Focus Adjustment | Automatic | - | |
| Special Effects (Front) | - | HDR, Spot Colour | |
| Camera Modes (Front) | - | Slow motion video, Pro mode, Timer mode, BurstShot, HYPERLAPSE, Watermark mode, portrait mode, Face Beauty, Timelapse video, Active photos, Cinemagraph, Portrait, Night Vision, Levelling, Gesture selfie, Group selfie, Long exposure mode, Live filter, Low Light AI Selfie, Capture Dual, Gesture Capture | |
| Face Recognition (Face ID) | - | Auto smile capture | Motorola Moto G31 has face detection. |
| Video Resolutions (Front) | - | 1920 x 1080 (1080p) at 30 fps | |
| Camera Features (Front) | Phase Detect Auto-Focus (PDAF) | Video image stabilisation, RAW photo, Shot optimisation, Selfie animation, Assistive grid |
| BATTERY AND CHARGING | Samsung Galaxy S21 Ultra 5G | Motorola Moto G31 |
|---|
| Battery Capacity (Battery Size) | 5000 mAh | 5000 mAh | Both phones have the same battery capacity. |
|---|---|---|---|
| Fast Charging Technology | Qualcomm Quick Charge 2.0, Adaptive Fast Charging, Samsung Super Fast Charging, Power Delivery 3.0 | - | Samsung Galaxy S21 Ultra 5G has fast charging technology. |
| Wireless Charging | Yes | - | Samsung Galaxy S21 Ultra 5G can be charged wirelessly. |
| Wireless Charging Standards | WPC, Qi, Fast Wireless Charging 2.0, Wireless PowerShare | - | |
| Talk Time | 2460 minutes | - | |
| Run Time Details | Talk (4G): up to 2460 min Active online usage (LTE): up to 18 hrs Active online usage (Wi-Fi): up to 18 hrs Playback (wireless video): up to 22 hrs Playback (wireless audio): up to 81 hrs |
Standard usage: up to 36 hrs |
| CELLULAR | Samsung Galaxy S21 Ultra 5G | Motorola Moto G31 |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 5G | 4G | Samsung Galaxy S21 Ultra 5G has more advanced generation mobile network. |
| Operating System | Android 11 | Android 11 | |
| Intelligent Assistant | Bixby | Google Assistant | |
| Payment Technology | Samsung Pay | - | |
| Navigation | GPS, GLONASS, BeiDou, Galileo | GPS, A-GPS, GLONASS, Galileo |
| COMMUNICATIONS | Samsung Galaxy S21 Ultra 5G | Motorola Moto G31 |
|---|
| Data Transmission | FDD-LTE, TDD-LTE, 5G NR FR1 | LTE | |
|---|---|---|---|
| 2G Band | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | - | |
| 3G UMTS Band | Band 1, Band 2, Band 4, Band 5, Band 8 | - | |
| 3G UMTS Frequency | 2100, 1900, 1700, 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 18, Band 19, Band 20, Band 25, Band 26, Band 28, Band 32, Band 38, Band 39, Band 40, Band 41, Band 66 | - | |
| 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 lower, FDD 800 upper, FDD 800 DD, FDD 1900+, FDD 850+, FDD 700 APT, FDD 1500 L, TDD 2600, TDD 1900, TDD 2300, TDD 2500, FDD 1700 - 2110 AWS-3 | - | |
| 5G NR Band | N1, n3, n5, n7, n8, n20, n28, n38, n41, n66, n77, n78, n40 | - | |
| 5G NR Frequency | FDD 2100, FDD 1800, FDD 850, FDD 2600, FDD 900, FDD 800, FDD 700APT, TDD TD 2600, TDD TD 2500, FDD AWS-3, TDD TD 3700, TDD TD 3500, TDD 2300 | - | |
| Wireless Interface | IEEE 802.11a/b/g/n/ac/ax | IEEE 802.11a/b/g/n/ac | |
| Bluetooth | Bluetooth 5.2 | Bluetooth 5.0 | |
| NFC | Yes | Yes | Both phones have an NFC reader for mobile payments. |
| MEDIA | Samsung Galaxy S21 Ultra 5G | Motorola Moto G31 |
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| Supported Digital Audio Standards | WAV, WMA, AAC, PCM, AMR, MP3, FLAC, XMF, OGG, MIDI, APE (Monkey's Audio), M4A, DSF, DSD, MXMF, OGA, 3GA, AWB, IMY, RTTTL, RTX, OTA, DFF, MID, DSD64, DSD128 | Dolby Atmos | |
|---|---|---|---|
| Supported Digital Video Standards | MKV, FLV, AVI, WMV, ASF, 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 | Samsung Galaxy S21 Ultra 5G | Motorola Moto G31 |
|---|
| Phone Functions | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | - | |
|---|---|---|---|
| Sensors | Accelerometer, ambient light sensor, proximity sensor, barometer, gyro sensor, hall sensor, geomagnetic sensor | Accelerometer, ambient light sensor, proximity sensor, digital compass, SAR sensor, gyroscope | |
| Security Devices | Fingerprint reader (under display), face recognition | Face recognition, fingerprint reader | |
| Security Technology | - | Face Unlock | |
| Additional Phone Features | Air View, MIMO technology, Smart Select, Samsung KNOX, Smart View, Live message, Screen off memo, Bixby Vision, Dual Audio, Bixby Routines, Intelligent Performance Enhancer, AR Doodle, PENUP, Bixby key, Samsung Knox Vault, Private Share function, Enhanced Game Booster, Air Command | Dual microphones |
| OTHERS | Samsung Galaxy S21 Ultra 5G | Motorola Moto G31 |
|---|
| Included Accessories | SIM card removal tool, USB-C to USB-C cable | Protective cover, USB cable, SIM card removal tool, 10W charger | |
|---|---|---|---|
| Compliant Standards | IP68, HAC (Hearing Aid Compatible) | - | |
| Max Depth of Water Resistance | 1.5 m | - |
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