Our Opinion

The Samsung Galaxy M31 128GB is a significantly better phone than the Xiaomi Mi A3 (6GB RAM, 128GB), and is also significantly better value for money. What should you buy? Go for the Samsung Galaxy M31 128GB!

Samsung Galaxy M31 128GB  Xiaomi Mi A3 (6GB RAM, 128GB) 
Samsung Galaxy M31 Xiaomi Mi A3
Buy Now Buy Buy
Excellence Score
54.1
35.0
Value for Money Score
82.6
71.9
Price ₹ 17,910 onwards ₹ 14,494 onwards
Launch Date (India) Mar, 2020 Aug, 2019
Expected Launch Date N/A N/A
Smartphone OS Android 10Expected update to next Android version Android 9.0 Pie, Upgradeable to Android 10Expected update to next Android versionAndroid One series
Touchscreen Yes (Capacitive) Yes (Capacitive)
Screen Size 6.4 inches 6.01 inches
Screen Resolution 1080x2340 pixels (~ 403 pixels per inch) 720x1560 pixels (~ 286 pixels per inch)
Tall Aspect Ratio / Minimal Bezels Yes Yes
Scratch Resistant Display Yes Yes, Corning Gorilla Glass 5
Display Type AMOLED AMOLED
Display Features Super AMOLED 2.5D Curved Glass
Full Physical QWERTY Keypad
Processor 2.3 GHz 2 GHz
Processor Type Octa Core Octa Core
Processor Name Samsung Exynos 9611Ranked #30 in Mobile Processor Benchmarks Qualcomm Snapdragon 665Ranked #39 in Mobile Processor Benchmarks
GPU Mali-G72 MP3 Adreno 610
RAM 6 GB 6 GB
3G Yes Yes
4G Yes Yes
VoLTE Yes Yes
WiFi Yes Yes
VoWiFi/WiFi-Calling Yes
GPS Yes Yes
Bluetooth Yes Yes
Connecting Port USB-C USB-C
Primary Camera 64MP + 8MP + 5MP + 5MP 48MP + 8MP + 2MP
Camera Auto-Focus Yes Yes
Camera Flash Yes Yes
HD Video Recording Yes (4K) Yes (4K)
Other Camera Features 64MP: f/1.8 aperture; 26mm Focal Length; 1/1.72" Sensor Size; 0.8um Pixel Size; PDAF, 8MP: f/2.2 aperture; 12mm Focal Length; Ultra-wide; 1/4.0" Sensor Size; 1.12um Pixel Size, 5MP: f/2.2 aperture; 25mm Focal Length; Macro Lens; 1/5.0" Sensor Size; 1.12um Pixel Size, 5MP: f/2.2 aperture; Depth Sensor, Panorama, HDR, Video: 2160p@30fps; 1080p@30fps; EIS 48MP: Sony IMX586 Sensor; 1.6um Pixel Size; 6p lens; F/1.79 Aperture; 1/2" Sensor Size; PDAF, 8MP: Ultra wide-angle camera; 118° Field-of-View; F/2.2 Aperture, 2MP: Depth Sensor, AI Portrait mode, Steady Handheld Night Photography, Video: 2160p@30fps; 1080p@30/60/120fps; 720p@240fps/120fps, EIS
Secondary Camera 32MP 32MP
Secondary Camera Features f/2.0 aperture, 26mm Focal Length, 1/2.8" Sensor Size, 0.8um Pixel Size, HDR F/2.0 Aperture, 1.6um Pixel Size, HDR, Panorama selfie, 5p lens, Video: 1080p@30fps
Internal Memory 128 GB 128 GB
Expandable Memory Slot Yes, up to 512 GB Yes, up to 256 GB
Contacts Storage Unlimited Unlimited
SMS Storage Unlimited Unlimited
Music Player Yes Yes
FM Radio Yes (Wireless) Yes
Dual SIM GSM+GSM GSM+GSM (Hybrid SIM slot)
Thickness 8.9 mmMedium 8.5 mmMedium
Weight 191 gmHeavy 173 gmMedium
Width 75.1 mmOk for one-handed use 71.9 mmComfortable for one-handed use
Audio Output 3.5mm jack 3.5mm jack
Water Resistant Yes, Splash Resistant (P2i Coating)
Battery Capacity 6000 mAh 4030 mAh
Battery Standby N/A N/A
Battery Standby (3G) N/A N/A
Battery Talktime N/A N/A
Battery Talktime (3G) N/A N/A
Fast Charging Support Yes, 15W Fast Charging Yes, 18W Quick Charge 3.0
Included Fast Charger Yes, 15.0W Fast Charger
Other Battery Parameters N/A N/A
Fingerprint sensor Yes Yes
Other Features UFS 2.1 Storage; FM Recording; Noise Filtration In-display Fingerprint Sensor; UFS 2.1 Storage; Noise Filtration
2-minute Review [Positives]
  • Decent looks and build quality - very similar to the Samsung Galaxy M30s, with a a unibody polycarbonate design, and glossy finish on the back panel - the only major difference is the camera module which now packs a fourth camera
  • The plastic body keeps the phone feeling relatively lightweight at 191 grams, which is mighty impressive for a phone packing a big 6000 mAh battery
  • It also feels great to hold with a seamless curved panel that meets the display up front
  • Modern, Infinity-U front - bezels around the screen are slim, except for a slightly thick chin - you still get around 90 per cent screen-to-body ratio, which is great
  • Fingerprint sensor at the back is easy to reach
  • Gorgeous, 6.4-inch FHD+ Super AMOLED display with excellent viewing angles, and brightness levels - easily one of the best displays in the price bracket
  • It also comes with "Widevine L1" certification, which helps stream content in crisp HD resolution
  • Blacks are deep on the AMOLED display, which looks good with Night mode enabled
  • Samsung's OneUI is today one of the more clean, refined Android UIs that's especially well optimised for large displays like this
  • One UI also brings in other useful stuff, like a System-wide Dark mode (which turns the background completely black, and looks great on the M30s' AMOLED display), and Always On Display option
  • Decent performance with the Exynos 9611 at the core (similar to Snapdragon 665) - the device is fairly quick to load up apps - multitasking is a breeze
  • Good quad rear camera setup - 64MP main sensor + 8MP wide-angle lens + 5MP depth sensor
  • Shots taken with the primary camera during daylight are quite satisfactory, images are detailed, especially the 64MP shots, and they showcase good dynamic range
  • The ultra-wide sensor, like on any budget phone, is a good addition - it takes social media-worthy images in great lighting conditions (in low-light, the quality dips and pictures look grainy and noisy, wide-angle shots also have barrel distortion at the edges)
  • Photos taken in low-light looks good - switching to Night mode helps reduce grain in the output and further improves image quality
  • Live Focus shots are quite impeccable and the camera app does give you the option to set the level of blur before taking a shot - edge detection is very good and the Galaxy M31 does a good job of separating the subject from the background
  • The macro camera takes decent shots outdoors (though, the quality dips when indoors and the output is restricted to 5MP in resolution)
  • The 32MP selfie camera is quite good and takes detailed selfies (though, in low light, the quality goes down a notch and results are grainy)
  • Overall, the cameras on the M30s are good for the price bracket, even though they are not the best (that title crowned to the POCO X2)
  • Monster 6000mAh battery delivers an incredible 2-3 days of usage easily, making for one of the largest battery life smartphones currently available
  • Supports 15W fast charging
  • Samsung has seen success with the Galaxy M30s, so it didn't want to fix what isn't broken, they upgraded the RAM, put in a fourth rear camera, and preloaded Android 10 - if you don't care for benchmark scores and just want a device that covers the basics and has great AMOLED display, has great battery backup and has a versatile set of cameras, the Galaxy M31 will do just fine
  • Premium build & gorgeous design: Dual Gorilla Glass 5 build, with an attractive, striking gradient design
  • Modern front panel, with a small notch
  • Compact form-factor - fairly easy to use one-handed
  • Decent, reasonably accurate under-display fingerprint scanner (it's not the fastest though)
  • Large, high-contrast AMOLED display
  • Being part of the Android One series, you get a simple/stock Android experience, along with a promise of minimum 2 years of Android updates
  • With the powerful Snapdragon 665 at the core, you get smooth dependable performance all-round - it's great for gaming too
  • Very good triple camera setup on the rear (48MP primary + 8MP ultra-wide + 2MP depth)
  • Images turn out with high level of detail and true-to-life colors - the contrast is also excellent, while the dynamic range is notably wide
  • 8MP images with the ultrawide-angle camera are decent too - its per-pixel quality is much lower than the main camera, but the colors are still nice, and noise is minimal
  • Portrait mode works well - shots are detailed, with excellent subject separation and convincing faux blur
  • Night mode works decently well too
  • Excellent selfies too, from the 32MP selfie camera - there is enough detail, the colors are nice, and the images are sharp enough
  • Good video recording performance too - both 4K and 1080p videos are sharp and detailed, contrast is excellent, color rendition is quite nice and true to life, and the dynamic range is decent - at 1080p 30fps, there is also EIS, which works well
  • Overall, the Mi A3 is easily one of the better camera phones in this price bracket, going head-to-head with excellent camera phones like the Redmi Note 7 Pro
  • Very good speaker - loud, with fairly rich and deep sound
  • Very good battery life with a large 4030mAH battery - you will comfortably get 1.5 days of use
  • Fast charging (Quick Charge 3.0) support, with up to 18W charger
  • Overall, the Mi A3 is an all-round good Android One phone, that does well on most counts, and additionally packs a stock Android experience (plus promised updates) - for a lot of users, who value a stock Android experience, and whose main consumption on the phone is images & video, it will be a good bet
2-minute Review [Negatives]
  • The power button and volumes are quite flush with the frame which means they lack that tactile, clicky feel
  • Design feels a bit dated and underwhelming, there is no spark in Galaxy M31's design as we see in other brand's phones like Xiaomi and Realme
  • However, this is an old chipset and heavy gaming isn't best on this phone - the Redmi Note 8 Pro, the POCO X2 and the Realme XT are much better options that will handle gaming better than the Galaxy M31
  • Samsung Galaxy M31 falls behind in fast charging as competitors are offering close to 30W fast charging, the 15W on M31 feels low
  • Having said that, the Redmi Note 8 Pro and the Realme X2 will still offer you more bang for your buck overall and when it comes to intensive tasks like gaming, you’ll be better off choosing the POCO X2 or the Redmi Note 8 Pro that are probably the best phones for gaming in this segment
  • The 720p resolution is on the low side though for a PenTile AMOLED display of that size, and this is the only weak-ish point of the Mi A3 - the screen is not the most ideally suited for long reading or browsing
  • The phones ships with a lower 10W charger though, that gives still decent, but not the quickest charging speeds - it recharges from 0 to 28% in 30 mins, while a full charge takes about 150 mins
  • But if you tend to do a lot of long reading on your phone, then you might want to consider higher resolution phones in this price bracket (and there are many good ones out there)
Expert Reviews
  1. If you don't care for benchmark scores and just want a device that covers the basics and has a great battery, the Galaxy M31 will do just fine... though, not the best bang for the buck
    gadgets.ndtv.com in-depth Read Review »
  2. Improved cameras, more RAM and the battery is just as reliable as before
    bgr.in in-depth Read Review »
  3. The combination of simple looks, lightweight design, capable quad cameras and perhaps above all the insanely long battery life makes the Galaxy 31 worth the money
    indianexpress.com in-depth Read Review »
  4. If you are looking for a smartphone that gives you long-lasting battery life, then Galaxy M31 is meant for you... not for power users though
    themobileindian.com in-depth Read Review »
  5. Massive 6000mAh battery, upgraded camera
    thenewsminute.com in-depth Read Review »
  6. Unbelievably compact for a smartphone that packs a massive 6000 mAh battery
    zeebiz.com in-depth Read Review »
  7. Perfect fit for the folks who aren't into gaming
    firstpost.com in-depth Read Review »
  8. You can go for Galaxy M31 if you want a reliable battery, an immersive display and camera-centric features packed in a handset... but it's no powerhouse
    timesnownews.com in-depth Read Review »
  9. The Samsung Galaxy M31 is a reliable smartphone that makes use of a great AMOLED display, has great battery backup and has a versatile set of cameras... but you’ll be better off choosing the POCO X2 or the Redmi Note 8 Pro if you like gaming
    in.mashable.com in-depth Read Review »
  10. Despite being good enough for now, the Galaxy M31 just doesn’t enthuse the kind of confidence that would see it being considered in the same breath as more powerful devices from Redmi and Realme
    indiatoday.in in-depth Read Review »
  11. gsmarena.com hands-on Read Review »
  12. fonearena.com hands-on Read Review »
  13. ibtimes.co.in hands-on Read Review »
  14. techpp.com hands-on Read Review »
  1. Gets many things right ...but the 720p screen makes the Mi A3 more of a niche device as it is best suited for gaming and videos instead of browsing and reading
    gsmarena.com in-depth Read Review »
  2. Two steps forward, one step back
    gadgets.ndtv.com in-depth Read Review »
  3. A good Android One phone...but the display is a compromise
    fonearena.com in-depth Read Review »
  4. Offers a lot of bang for the buck, but competition in this price segment is fierce to say the least....this one is for the purists
    bgr.in in-depth Read Review »
  5. Pretty good value smartphone...a safe bet for people looking for a cheap and cheerful smartphone that comes with all the right features, and none of the hassle
    androidauthority.com in-depth Read Review »
  6. A good choice for an affordable phone
    trustedreviews.com in-depth Read Review »
  7. Worth buying if you want a stock Android phone in this price bracket...but there are compromises too
    indianexpress.com in-depth Read Review »
  8. The 720p display really complicates what is otherwise a very agreeable Android phone
    news18.com in-depth Read Review »
  9. An otherwise solid phone with one major drawback - a 720p display
    androidcentral.com in-depth Read Review »
  10. Xiaomi Mi A3 has everything that should be there in a mid-segment smartphone, however, the display resolution could be a dampener for some
    business-standard.com in-depth Read Review »
  11. Good but not great
    indiatoday.in in-depth Read Review »
  12. A very good device for Android One fans..but if you do not value stock Android, then consider alternatives
    techpp.com in-depth Read Review »
  13. A pretty solid offering that offers a lot for its price
    in.mashable.com in-depth Read Review »
  14. Buy the Mi A3 if you want an all-rounder of an Android One smartphone that is priced just right
    firstpost.com in-depth Read Review »
  15. Offers great value...a rival to the Google Pixel 3A in photography and performance, but at a significantly lower price
    techadvisor.co.uk in-depth Read Review »
  16. notebookcheck.net in-depth Read Review »
  17. techradar.com hands-on Read Review »
User Reviews
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Official Website Official Website » Official Website »
Unofficial specs? N/A N/A
Individual Review 2
  • Individual Review 2
Individual Review

Samsung Galaxy M31 Review with Pros & Cons...

Geekyranjit

Top Pick

Individual Review

Full review: Xiaomi's Mi A3 is confusing as hell...

Android Authority

Top Pick

Full Review

Samsung Galaxy M31 Review with Pros & Cons

Geekyranjit

Full Review

Full review: Xiaomi's Mi A3 is confusing as hell

Android Authority

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