Samsung Galaxy M21 vs Samsung Galaxy M31s

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Display

Size

6.4 inches
6.5 inches

Resolution

2340 x 1080 pixels, 19.5:9 ratio,
403 PPI
2340 x 1080 pixels, 20:9 ratio,
396 PPI

Technology

Super AMOLED
Super AMOLED

Screen-to-body

84.11 %
86.62 %

Peak brightness

420 cd/m2 (nit)
 

Features

Scratch-resistant glass (Corning Gorilla Glass 3), Proximity sensor
Scratch-resistant glass (Corning Gorilla Glass 3), Ambient light sensor, Proximity sensor

Hardware

System chip

Exynos 9611
Samsung Exynos 9611

Processor

Octa-core, 2300 MHz, Arm Cortex-A73 and Arm Cortex-A53, 64-bit, 10 nm
Octa-core, 2300 MHz, Arm Cortex-A73 and Arm Cortex-A53, 64-bit, 10 nm

GPU

Mali-G72 MP3
Mali-G72 MP3

RAM

4GB LPDDR4
6GB LPDDR4

Internal storage

64GB, available to use: 49 GB
128GB, available to use: 106.4 GB

Storage expansion

microSDXC up to 512 GB
microSDXC up to 512 GB

OS

Android (10), Samsung One UI
Android (10), Samsung One UI

Battery

Capacity

6000 mAh
6000 mAh

Type

Li - Polymer, Not user replaceable
Not user replaceable

Charging

Fast charging
Fast charging, Reverse charging

Max charge speed

 
Wired: 25.0W

Camera

Rear

Triple camera
Quad camera

Main camera

48 MP (PDAF)
64 MP (PDAF)

Specifications

Aperture size: F2.0; Focal length: 26 mm; Sensor size: 1/2"; Pixel size: 0.8 μm
Aperture size: F1.8; Pixel size: 0.8 μm

Second camera

8 MP (Ultra-wide)
12 MP (Ultra-wide)

Specifications

Aperture size: F2.2; Focal Length: 12 mm; Sensor size: 1/4"; Pixel size: 1.12 μm
Aperture size: F2.2

Third camera

5 MP (Depth information)
5 MP (Macro)

Specifications

Aperture size: F2.2
 

Fourth camera

 
5 MP (Depth information)

Video recording

3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD), 1280x720 (HD) (240 fps)
3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD), 1280x720 (HD) (480 fps)

Features

EIS
Hyperlapse

Front

20 MP (HDR)
32 MP

Design

Dimensions

6.26 x 2.96 x 0.35 inches (159.0 x 75.1 x 8.9 mm)
6.27 x 2.93 x 0.37 inches (159.3 x 74.4 x 9.3 mm)

Weight

6.63 oz (188.0 g)
the average is 6.2 oz (176 g)
7.16 oz (203.0 g)
the average is 6.2 oz (176 g)

Materials

Back: Plastic; Frame: Plastic
 

Biometrics

2D Face unlock, Fingerprint (touch)
Fingerprint (touch)

Colors

Midnight blue, Raven black
Mirage black, Mirage blue

Cellular

LTE (FDD)

Bands 1(2100), 3(1800), 5(850), 7(2600), 8(900), 20(800 DD)
Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 17(700 b), 20(800 DD), 26(850+), 28(700 APT), 66(AWS-3)

LTE (TDD)

Bands 38(2600), 40(2300), 41(2600+)
Bands 38(2600), 40(2300), 41(2600+)

UMTS

850, 900, 1900, 2100 MHz
850, 900, 1700/2100, 1900, 2100 MHz

Data Speed

LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s

Dual SIM

Yes
Yes

SIM type

Nano SIM
Nano SIM

Multimedia

Headphones

3.5mm jack
3.5mm jack

Speakers

Earpiece, Loudspeaker
Earpiece, Loudspeaker

Features

Dolby Atmos
 

Screen mirroring

Wireless screen share
Wireless screen share

Radio

FM
 

Connectivity & Features

Bluetooth

5.0
5.0

Wi-Fi

802.11 a, b, g, n, ac, dual-band; Wi-Fi Direct, Hotspot
802.11 a, b, g, n, ac, dual-band; Wi-Fi Direct, Hotspot

USB

Type-C (reversible), USB 2.0
Type-C (reversible), USB 2.0

Features

Charging
Charging, OTG

Location

GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning
GPS, A-GPS, Cell ID, Wi-Fi positioning

Sensors

Accelerometer, Gyroscope
Accelerometer, Gyroscope, Compass
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