Display
Size:
5.8 inches
6.4 inches
Resolution:
2960 x 1440 pixels, 18.5:9 ratio, 568 PPI
2340 x 1080 pixels, 19.5:9 ratio, 403 PPI
Technology:
Super AMOLED
Super AMOLED
Screen-to-body:
84.36 %
83.97 %
Peak brightness:
420 cd/m2 (nit)
Features:
HDR support, Scratch-resistant glass (Corning Gorilla Glass 5), Ambient light sensor, Proximity sensor
Scratch-resistant glass (Corning Gorilla Glass 3), Ambient light sensor, Proximity sensor
Hardware
System chip:
Qualcomm Snapdragon 845 SDM845
Exynos 9611
Processor:
Octa-core, 2800 MHz, Kryo 385, 64-bit, 10 nm
Octa-core, 2300 MHz, Arm Cortex-A73 and Arm Cortex-A53, 64-bit, 10 nm
GPU:
Adreno 630
Mali-G72 MP3
RAM:
4GB LPDDR4
6GB LPDDR4
Internal storage:
64GB
64GB (UFS 2.1), available to use: 49 GB
Storage expansion:
microSDXC up to 400 GB
microSDXC up to 512 GB
Device type:
Smartphone
Smartphone
OS:
Android (10, 9.0 Pie, 8.0 Oreo), Samsung One UI
Android (11, 10), Samsung One UI
Battery
Capacity:
3000 mAh
6000 mAh
Type:
Li - Ion, Not user replaceable
Li - Polymer, Not user replaceable
Charging:
Qualcomm Quick Charge 2.0, Samsung Adaptive Fast Charging, Qi and Powermat wireless charging
Fast charging
Max charge speed:
Wired: 15.0W
Camera
Rear:
Single camera
Quad camera
Main camera:
12 MP (OIS, PDAF)
64 MP (PDAF)
Specifications:
Aperture size: F1.5/F2.4; Sensor size: 1/2.55"; Pixel size: 1.4 μm
Aperture size: F1.8; Focal length: 26 mm; Sensor size: 1/1.7"; Pixel size: 0.8 μm
Second camera:
8 MP (Ultra-wide)
Specifications:
Aperture size: F2.2; Focal Length: 12 mm; Sensor size: 1/4"; Pixel size: 1.12 μm
Third camera:
5 MP (Macro)
Specifications:
Aperture size: F2.2; Focal Length: 25 mm; Sensor size: 1/5"; Pixel size: 1.12 μm
Fourth camera:
5 MP (Depth information)
Specifications:
Aperture size: F2.2
Video recording:
3840x2160 (4K UHD) (60 fps), 1920x1080 (Full HD) (240 fps), 1280x720 (HD) (960 fps)
3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD), 1280x720 (HD) (240 fps)
Features:
HDR, Time-lapse video, Hyperlapse, Continuous autofocus, Object tracking, Picture-taking during video recording, Video calling, Video sharing
Hyperlapse, EIS
Front:
8 MP (Autofocus, HDR)
32 MP (HDR, Slow-motion videos)
Video capture:
2560x1440 (QHD) (30 fps)
1920x1080 (Full HD)
Design
Dimensions:
5.81 x 2.70 x 0.33 inches (147.7 x 68.7 x 8.5 mm)
6.27 x 2.96 x 0.35 inches (159.2 x 75.1 x 8.9 mm)
Weight:
5.75 oz (163.0 g)
6.74 oz (191.0 g)
Materials:
Back: Glass (Corning Gorilla Glass 5); Frame: Aluminum
Back: Plastic; Frame: Plastic
Resistance:
Water, Dust; IP68
Biometrics:
Iris scanner, 2D Face unlock, Fingerprint (touch)
2D Face unlock, Fingerprint (touch)
Features:
Notification light
Keys:
Left: Volume control, Other; Right: Lock/Unlock key
Right: Volume control, Lock/Unlock key
Colors:
Midnight black, Coral blue, Titanium gray, Lilac purple, Burgundy red, Sunrise gold, Ice blue
Blue, Black, Red
Cellular
LTE (FDD):
Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 13(700 c), 14(700 PS), 17(700 b), 18(800 Lower), 19(800 Upper), 20(800 DD), 25(1900+), 26(850+), 28(700 APT), 29(700 d), 30(2300 WCS), 66(AWS-3), 71(600)
Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 13(700 c), 17(700 b), 20(800 DD), 26(850+), 28(700 APT), 66(AWS-3)
LTE (TDD):
Bands 38(2600), 39(1900+), 40(2300), 41(2600+), 46
Bands 38(2600), 40(2300), 41(2600+)
UMTS:
Bands 5(850), 8(900), 4(1700/2100), 2(1900), 1(2100)
Bands 5(850), 8(900), 4(1700/2100), 2(1900), 1(2100)
Data Speed:
LTE-A Pro Cat 18 (1200/150 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA
LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
Dual SIM:
Yes
SIM type:
Nano SIM
Nano SIM
VoLTE:
Yes
Multimedia
Headphones:
3.5mm jack
3.5mm jack
Speakers:
Earpiece, Multiple speakers
Earpiece, Loudspeaker
Features:
32-Bit DAC, aptX-HD
Dolby Atmos
Screen mirroring:
Wireless screen share
Wireless screen share
Radio:
FM
FM
Additional microphone(s):
for Noise cancellation
for Noise cancellation
Connectivity & Features
Bluetooth:
5.0
5.0
Wi-Fi:
802.11 a, b, g, n, ac, dual-band; MIMO, Wi-Fi Direct, Hotspot
802.11 a, b, g, n, ac, dual-band; Wi-Fi Direct, Hotspot
USB:
Type-C (reversible), USB 3.1
Type-C (reversible), USB 2.0
Features:
Charging, OTG, Video out
Charging
Location:
GPS, A-GPS, Glonass, Galileo, BeiDou
GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning
Sensors:
Accelerometer, Gyroscope, Compass, Hall (for flip covers), Barometer
Accelerometer, Gyroscope, Compass
Other:
NFC, ANT+
NFC
Regulatory Approval
FCC approval:
Date approved:
Jan 11, 2018
Feb 07, 2020
Measured SAR:
Head:
0.35 W/kg
0.42 W/kg
Body:
0.96 W/kg
0.41 W/kg
Simultaneous Transmission:
1.59 W/kg
1.54 W/kg
Wireless Router:
0.95 W/kg
0.74 W/kg
Buyers information
Price:
$ 720
€ 240
User Manual:
This is the official Samsung Galaxy M31 User Guide in English provided from the manufacturer.
In The Box:
15W fast charger, Data cable, Ejection pin, User Manual
Availability
Officially announced:
Feb 25, 2018
Feb 25, 2020
