Xiaomi Redmi 9A vs Samsung Galaxy A02s vs Samsung Galaxy A31

Compare phone and tablet specifications of up to three devices at once.

Comparison mode:

Display

Size:

6.5 inches
6.5 inches
6.4 inches

Resolution:

1600 x 720 pixels, 20:9 ratio, 269 PPI
1600 x 720 pixels, 20:9 ratio, 270 PPI
2400 x 1080 pixels, 20:9 ratio, 411 PPI

Technology:

IPS LCD
IPS LCD
Super AMOLED

Screen-to-body:

81.15 %
81.80 %
84.88 %

Features:

Ambient light sensor, Proximity sensor
Ambient light sensor, Proximity sensor
60Hz refresh rate, Ambient light sensor, Proximity sensor

Hardware

System chip:

MediaTek Helio G25
Qualcomm Snapdragon 450 SDM450
MediaTek Helio P65 MT6768

Processor:

Octa-core, 2000 MHz, Arm Cortex-A53, 64-bit, 12 nm
Octa-core, 1800 MHz, Cortex-A53, 64-bit, 14 nm
Octa-core, 2000 MHz, Arm Cortex-A75 and Arm Cortex-A55, 64-bit, 12 nm

GPU:

PowerVR GE8320
Adreno 506
Mali-G52 MC2

RAM:

2GB LPDDR4
3GB
4GB LPDDR4

Internal storage:

32GB (eMMC 5.1)
32GB (eMMC 5.1), available to use: 20.5 GB
64GB (eMMC 5.1), available to use: 46.2 GB

Storage expansion:

microSDXC
microSDXC up to 1024 GB
microSDXC up to 512 GB

Device type:

Smartphone
Smartphone
Smartphone

OS:

Android (10)
Android (11, 10)
Android (10), Samsung One UI

Battery

Capacity:

5000 mAh
5000 mAh
5000 mAh

Type:

Li - Polymer, Not user replaceable
Li - Polymer, Not user replaceable
Li - Polymer, Not user replaceable

Charging:

Samsung Adaptive Fast Charging
Fast charging

Max charge speed:

Wired: 10.0W
Wired: 15.0W
Wired: 15.0W

Camera

Rear:

Single camera
Triple camera
Quad camera

Main camera:

13 MP (PDAF)
13 MP (Autofocus)
48 MP (PDAF)

Specifications:

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

Second camera:

2 MP (Macro)
8 MP (Ultra-wide)

Specifications:

Aperture size: F2.4
Aperture size: F2.2; Sensor size: 1/4"; Pixel size: 1.12 μm

Third camera:

2 MP (Depth information)
5 MP (Macro)

Specifications:

Aperture size: F2.4
Aperture size: F2.4

Fourth camera:

5 MP (Depth information)

Specifications:

Aperture size: F2.4

Video recording:

1920x1080 (Full HD) (60 fps)
1920x1080 (Full HD) (30 fps)
1920x1080 (Full HD) (30 fps)

Front:

5 MP (HDR)
5 MP
20 MP

Video capture:

1920x1080 (Full HD)
1920x1080 (Full HD)

Design

Dimensions:

6.49 x 3.03 x 0.35 inches (164.9 x 77.07 x 9 mm)
6.46 x 2.99 x 0.36 inches (164.2 x 75.9 x 9.1 mm)
6.27 x 2.88 x 0.34 inches (159.3 x 73.1 x 8.6 mm)

Weight:

6.91 oz (196.0 g)
6.91 oz (196.0 g)
6.53 oz (185.0 g)

Materials:

Back: Plastic
Back: Plastic; Frame: Plastic
Back: Plastic

Materials & Colors:

Carbon grey, Sky blue, Ocean green

Biometrics:

2D Face unlock
In-screen fingerprint

Keys:

Right: Volume control, Lock/Unlock key
Right: Volume control, Lock/Unlock key
Right: Volume control, Lock/Unlock key

Colors:

Black, White, Blue
Prism Crush black, Prism Crush blue, Prism Crush red, Prism Crush white

Cellular

LTE (FDD):

Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 20(800 DD), 28(700 APT)
Bands 1(2100), 3(1800), 5(850), 7(2600), 8(900), 20(800 DD), 28(700 APT)
Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 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+)
Bands 38(2600), 40(2300), 41(2600+)

UMTS:

Bands 5(850), 8(900), 4(1700/2100), 2(1900), 1(2100)
Bands 1(2100), 5(850), 8(900)
Bands 1(2100), 2(1900), 5(850), 8(900)

Data Speed:

LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
LTE Cat 4 (150/50 Mbit/s), 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
Yes

SIM type:

Nano SIM
Nano SIM
Nano SIM

HD Voice:

Yes

VoLTE:

Yes

Multimedia

Headphones:

3.5mm jack
3.5mm jack
3.5mm jack

Speakers:

Earpiece, Loudspeaker
Earpiece, Loudspeaker
Earpiece, Loudspeaker

Screen mirroring:

Wireless screen share
Wireless screen share
Wireless screen share

Radio:

FM

Additional microphone(s):

for Noise cancellation
for Noise cancellation

Connectivity & Features

Bluetooth:

5.0
4.2
5.0

Wi-Fi:

802.11 b, g, n; Wi-Fi Direct, Hotspot
802.11 b, g, n, 802.1x; Wi-Fi Direct, Hotspot
802.11 a, b, g, n, ac, dual-band; Wi-Fi Direct, Hotspot

USB:

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

Features:

Charging
Charging, Mass storage device
Charging, OTG

Location:

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

Sensors:

Accelerometer
Accelerometer
Accelerometer, Gyroscope, Compass

Other:

NFC

Regulatory Approval

FCC approval:

Date approved:

Feb 07, 2021
Mar 08, 2020

FCC ID value:

ZCASMA025U
A3LSMA315GL

Measured SAR:

Head:

1.00 W/kg
0.53 W/kg

Body:

0.85 W/kg
0.56 W/kg

Simultaneous Transmission:

1.40 W/kg
1.42 W/kg

Wireless Router:

0.85 W/kg
0.65 W/kg

Phablet:

0.89 W/kg

Buyers information

Price:

€ 300

In The Box:

Power adapter, 5V2A Charger, Micro-USB cable, SIM eject tool, Warranty card, User guide
Power brick, USB Cable, Headphones, Sim Card extractor tool

Availability

Officially announced:

Mar 24, 2020
FCC OKs Cingular\'s purchase of AT&T Wireless