Samsung Galaxy S9 vs Xiaomi Mi A3

Network
2G network

GSM 850, 900, 1800, 1900

GSM 850, 900, 1800, 1900
3G network

HSDPA 850, 900, 1700(AWS), 1900, 2100

HSDPA 850, 900, 1700, 1900, 2100
4G network

LTE

LTE frequency band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 20(800), 28(700), 38(2600), 40(2300)
HSDPA speed

42.2 Mbps

42 Mbps
HSUPA speed

5.76 Mbps

5.76 Mbps
LTE speed

-

LTE, Cat12, 603 Mbps download, 102 Mbps upload
LTE-A speed

LTE-A, (6CA) Cat18, 1200 Mbps download, 200 Mbps upload

-
GPRS

Yes

Yes
EDGE

Yes

Yes

Design
Build

Front/back glass (Gorilla Glass 5), aluminum frame

Aluminium alloy, glass
SIM

Single SIM (Nano-SIM) or Hybrid Dual SIM (Nano-SIM, dual stand-by)

Dual SIM (Nano-SIM, dual stand-by)
Height

147.7 mm

153.48 mm
Width

68.7 mm

71.85 mm
Thickness

8.5 mm

8.48 mm
Weight

163 g

173 g
Payment

Samsung Pay(Visa, Mastercard certified)

-
Waterproof

IP68, 1.5m and 30 minutes

-
Dust proof

Yes, IP68

-
Colors

Coral Blue, Lilac Purple, Midnight Black, Titanium Gray

Black, Blue, White

Display
Display type

Super AMOLED capacitive touchscreen

Super AMOLED capacitive touchscreen
Physical size

5.8 inches

6.09 inches
Resolution

1440 x 2960 pixels

720 x 1560 pixels
Pixel density

570 ppi

282 ppi
Display colors

16777216

16777216
Protection

Corning Gorilla Glass 5

Scratch resistant, Corning Gorilla Glass 5
Multitouch

Yes

Yes
Display features

HDR10 compliant, 3D Touch, Always-on display

HDR10, DC dimming

Hardware
CPU

Octa-core

Octa-core
CPU

Quad-core 2.7 GHz Mongoose M3

Quad-core 2.0 GHz Kryo 260
CPU(second)

quad-core 1.8 GHz Cortex-A55

quad-core 1.8 GHz Kryo 260
Chipset

Exynos 9810 Octa / Qualcomm SDM845 Snapdragon 845

Qualcomm SDM665 Snapdragon 665
GPU

Mali-G72 MP18 / Adreno 630

Adreno 610
Memory RAM

4 GB

4 GB
Internal storage

64, 128, 256 GB

64, 128 GB
Memory card

microSD(uses second SIM slot)

microSD, microSDHC, microSDXC
Memory card max

400 GB

256 GB
Storage

-

UFS 2.1

Main camera
Camera type

Photo / Video

-
Camera type

-

Triple
Main camera

12 MP, f/1.5-2.4 , 26 mm, 1/2.5" , 1.4 µm

48 MP, f/1.79 , 1/2" , 0.8 µm
8 MP, f/2.2 , 1.12 µm
2 MP, f/2.4 , 1.75 µm
Primary camera resolution

4032 x 3024 pixels

8000 x 6000 pixels
Primary camera video

2160p@60fps, 1080p@240fps, 720p@960fps

2160p@30fps, 1080p@30/60/120fps
Primary camera Autofocus

dual pixel phase detection autofocus

-
Primary camera flash

LED flash

dual-LED flash
Primary camera optical image stabilization

optical image stabilization

-
Primary camera video dual video

dual-video record

-
Primary camera video hdr

HDR

-
Camera features

Auto HDR, Geo-tagging, face/smile detection, panorama, simultaneous 4K video and 9MP image recording, touch focus

Autofocus, continuous shooting, digital zoom, optical image stabilization, geotagging, panorama, HDR, touch focus, face detection, white balance settings, ISO settings, exposure compensation, self-timer, scene-mode

Connectivity
WLAN

Wi-Fi 802.11a, 802.11b, 802.11g, 802.11n, 802.11ac

Wi-Fi 802.11a, 802.11b, 802.11g, 802.11n, 802.11n 5Ghz, 802.11ac
WLAN WiFi Hotspot

Yes

Yes
WLAN WiFi Direct

Yes

Yes
Wi-Fi display

-

Yes
WLAN WiFi Dual Band

Yes

Yes
USB

Type-C 1.0 reversible connector

Type-C 1.0 reversible connector
USB On-The-Go

-

Yes
Bluetooth

v5.0

v5.0
Bluetooth A2DP

Yes

Yes
bluetooth HID

-

Yes
bluetooth LE

Yes

Yes
Bluetooth EDR

-

Yes
Bluetooth AptX

Yes

aptX HD
Infrared

-

Yes
NFC

Yes

Yes
GPS

Yes, with A-GPS

Yes, with A-GPS
GLONASS

Yes

Yes
GALILEO

Yes

Yes
Beidou

-

Yes
BDS

Yes

-

Features
Messaging SMS

SMS(threaded view)

-
Messaging MMS

MMS

-
Messaging Email

Email

-
Messaging IM

IM

-
Messaging Push Mail

Push Mail

-
Sensors

Iris scanner, SpO2, accelerometer, barometer, compass, fingerprint (rear-mounted), gyro, heart rate, proximity

Accelerometer, compass, gyroscope, fingerprint, light, proximity, in-display fingerprint sensor