Samsung Galaxy M31s vs Samsung Galaxy M21

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Display

Size

6.5 inches
6.4 inches

Resolution

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

Technology

Super AMOLED
Super AMOLED

Screen-to-body

86.62 %
84.11 %

Peak brightness

 
420 cd/m2 (nit)

Features

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

Hardware

System chip

Samsung Exynos 9611
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

6GB LPDDR4
4GB LPDDR4

Internal storage

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

Not user replaceable
Li - Polymer, Not user replaceable

Charging

Fast charging, Reverse charging
Fast charging

Max charge speed

Wired: 25.0W
 

Camera

Rear

Quad camera
Triple camera

Main camera

64 MP (PDAF)
48 MP (PDAF)

Specifications

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

Second camera

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

Specifications

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

Third camera

5 MP (Macro)
5 MP (Depth information)

Specifications

 
Aperture size: F2.2

Fourth camera

5 MP (Depth information)
 

Video recording

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

Features

Hyperlapse
EIS

Front

32 MP
20 MP (HDR)

Design

Dimensions

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

Weight

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

Materials

 
Back: Plastic; Frame: Plastic

Biometrics

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

Colors

Mirage black, Mirage blue
Midnight blue, Raven black

Cellular

LTE (FDD)

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)
Bands 1(2100), 3(1800), 5(850), 7(2600), 8(900), 20(800 DD)

LTE (TDD)

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

UMTS

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

Location

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

Sensors

Accelerometer, Gyroscope, Compass
Accelerometer, Gyroscope
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