Comparison between:
- Samsung Galaxy A30s
- Samsung Galaxy A31
- Samsung Galaxy A51
- Xiaomi Mi A2

Brand and model

Information about the brand, model and model alias (if any) of a specific device.

Samsung Galaxy A30sSamsung Galaxy A31Samsung Galaxy A51Xiaomi Mi A2
Samsung Galaxy A30s
Prices
Samsung Galaxy A31
Prices
Samsung Galaxy A51
Prices
Xiaomi Mi A2
Prices
Model aliasSM-A307FN
A307FN
SM-A315FSM-A515F/DS
SM-A515F/DSN
SM-A515FN/DS
SM-A515GN/DS
SM-A515FM/DS
SM-A515YN
SM-A515W
-

Design

Information about the dimensions and weight of the device, shown in different measurement units. Body materials, available colors, certifications.

Width74.7 mm
7.47 cm
0.245 ft
2.941 in
73.1 mm
7.31 cm
0.24 ft
2.878 in
73.6 mm
7.36 cm
0.241 ft
2.898 in
75.4 mm
7.54 cm
0.247 ft
2.969 in
Height158.5 mm
15.85 cm
0.52 ft
6.24 in
159.3 mm
15.93 cm
0.523 ft
6.272 in
158.5 mm
15.85 cm
0.52 ft
6.24 in
158.7 mm
15.87 cm
0.521 ft
6.248 in
Thickness7.8 mm
0.78 cm
0.026 ft
0.307 in
8.6 mm
0.86 cm
0.028 ft
0.339 in
7.9 mm
0.79 cm
0.026 ft
0.311 in
7.3 mm
0.73 cm
0.024 ft
0.287 in
Weight166 g
0.37 lbs
5.86 oz
185 g
0.41 lbs
6.53 oz
172 g
0.38 lbs
6.07 oz
168 g
0.37 lbs
5.93 oz
Volume92.35 cm³
5.61 in³
100.15 cm³
6.08 in³
92.16 cm³
5.6 in³
87.35 cm³
5.3 in³
ColorsPrism Crush Black
Prism Crush White
Prism Crush Violet
Prism Crush Green
Prism Crush Black
Prism Crush Blue
Prism Crush Red
Prism Crush White
Prism Crush Blue
Prism Crush Black
Prism Crush Pink
Prism Crush White
Black
Blue
Gold
Body materialsPlasticPlasticPlasticAluminium alloy

SIM card

The Subscriber Identity Module (SIM) is used in mobile devices for storing data authenticating the subscribers of mobile services.

SIM card typeNano-SIMNano-SIMNano-SIMNano-SIM
Number of SIM cards2222
FeaturesDual SIM stand-by (Both cards are active. When one is busy, the other is not active)Dual SIM stand-by (Both cards are active. When one is busy, the other is not active)Dual SIM stand-by (Both cards are active. When one is busy, the other is not active)Dual SIM stand-by (Both cards are active. When one is busy, the other is not active)

Networks

A mobile (cellular) network is a radio system, which allows a large number of mobile devices to communicate with each other.

GSMGSM 850 MHz (B5)
GSM 900 MHz (B8)
GSM 1800 MHz (B3)
GSM 1900 MHz (B2)
GSM 850 MHz (B5)
GSM 900 MHz (B8)
GSM 1800 MHz (B3)
GSM 1900 MHz (B2)
GSM 850 MHz (B5)
GSM 900 MHz (B8)
GSM 1800 MHz (B3)
GSM 1900 MHz (B2)
GSM 850 MHz
GSM 900 MHz
GSM 1800 MHz
GSM 1900 MHz
UMTSUMTS 850 MHz (B5)
UMTS 900 MHz (B8)
UMTS 1900 MHz (B2)
UMTS 2100 MHz (B1)
UMTS 850 MHz (B5)
UMTS 900 MHz (B8)
UMTS 1900 MHz (B2)
UMTS 2100 MHz (B1)
UMTS 850 MHz (B5)
UMTS 900 MHz (B8)
UMTS 1900 MHz (B2)
UMTS 2100 MHz (B1)
UMTS 850 MHz
UMTS 900 MHz
UMTS 1700/2100 MHz
UMTS 1900 MHz
UMTS 2100 MHz
LTELTE-FDD 850 MHz (B5)
LTE-FDD 900 MHz (B8)
LTE-FDD 1900 MHz (B25)
LTE-FDD 2100 MHz (B1)
LTE-FDD 2600 MHz (B7)
LTE-FDD 850 MHz (B5)
LTE-FDD 900 MHz (B8)
LTE-FDD 1900 MHz (B25)
LTE-FDD 2100 MHz (B1)
LTE-FDD 2600 MHz (B7)
LTE-FDD 850 MHz (B5)
LTE-FDD 900 MHz (B8)
LTE-FDD 1800 MHz (B3)
LTE-FDD 2100 MHz (B1)
LTE-FDD 2600 MHz (B7)
LTE 800 MHz
LTE 850 MHz
LTE 900 MHz
LTE 1700/2100 MHz
LTE 1800 MHz
LTE 1900 MHz
LTE 2100 MHz
LTE 2600 MHz
LTE-TDD 2300 MHz (B40)
LTE-TDD 2600 MHz (B38)

Mobile network technologies and bandwidth

Communication between devices within mobile networks is realized via various generations of network technologies, which provide different bandwidth.

Mobile network technologiesUMTS
EDGE
GPRS
HSPA+
LTE Cat 10
UMTS
EDGE
GPRS
HSPA+
LTE Cat 10
UMTS
EDGE
GPRS
HSPA+
LTE Cat 12
UMTS
EDGE
GPRS
HSPA+
LTE Cat 12

Operating system

Operating system is the system software, which manages and controls the functioning of the hardware components of the device.

Operating system (OS)Android 9.0 PieAndroid 10Android 10Android 8.1 Oreo
Android 9.0 Pie
User interface (UI)One UI 1.1One UI 2.0One UI 2.0-

System on Chip (SoC)

A system on a chip (SoC) includes into a single chip some of the main hardware components of the mobile device.

SoCSamsung Exynos 7 Octa 7904MediaTek Helio G70Samsung Exynos 7 Octa 9611Qualcomm Snapdragon 660 MSM8976 Plus
Process technology14 nm12 nm10 nm14 nm
CPU2x 1.8 GHz ARM Cortex-A73, 6x 1.6 GHz ARM Cortex-A532x 2.0 GHz Cortex-A75, 6x 1.7 GHz Cortex-A554x 2.3 GHz ARM Cortex-A73, 4x 1.7 GHz ARM Cortex-A534x 2.2 GHz Kryo 260, 4x 1.84 GHz Kryo 260
CPU bits64 bit64 bit64 bit64 bit
Instruction setARMv8-AARMv8-AARMv8-AARMv8
CPU cores8888
CPU frequency1800 MHz2000 MHz2300 MHz2200 MHz
GPUARM Mali-G71 MP2ARM Mali-G52 2EEMC2ARM Mali-G72 MP3Qualcomm Adreno 512
GPU cores2-3-
GPU frequency-820 MHz-650 MHz
RAM capacity4 GB4 GB
6 GB
4 GB
6 GB
8 GB
4 GB
6 GB
RAM typeLPDDR4XLPDDR4XLPDDR4XLPDDR4X
RAM channelsDouble channelDouble channelDouble channelDouble channel
RAM frequency---1866 MHz

Storage

Every mobile device has a built-in storage (internal memory) with a fixed capacity.

Storage64 GB
128 GB
64 GB
128 GB
64 GB
128 GB
32 GB
64 GB
128 GB
eMMC 5.1eMMC 5.1-eMMC 5.1

Memory cards

Memory cards are used in mobile devices for expanding their external storage capacity.

TypesmicroSD
microSDHC
microSDXC
microSD
microSDHC
microSDXC
microSD
microSDHC
microSDXC
-

Display

The display of a mobile device is characterized by its technology, resolution, pixel density, diagonal length, color depth, etc.

Type/technologySuper AMOLEDSuper AMOLEDSuper AMOLEDIPS
Diagonal size6.4 in
162.56 mm
16.26 cm
6.4 in
162.56 mm
16.26 cm
6.5 in
165.1 mm
16.51 cm
5.99 in
152.15 mm
15.21 cm
Width2.68 in
68.12 mm
6.81 cm
2.63 in
66.71 mm
6.67 cm
2.67 in
67.75 mm
6.78 cm
2.68 in
68.04 mm
6.8 cm
Height5.81 in
147.6 mm
14.76 cm
5.84 in
148.24 mm
14.82 cm
5.93 in
150.56 mm
15.06 cm
5.36 in
136.08 mm
13.61 cm
Aspect ratio2.167:12.222:12.222:12:1
2:1 (18:9)
Resolution720 x 1560 pixels1080 x 2400 pixels1080 x 2400 pixels1080 x 2160 pixels
Pixel density268 ppi
105 ppcm
411 ppi
161 ppcm
405 ppi
159 ppcm
403 ppi
158 ppcm
Color depth24 bit
16777216 colors
24 bit
16777216 colors
24 bit
16777216 colors
24 bit
16777216 colors
Display area85.2 %85.2 %87.72 %77.63 %
Other featuresCapacitive
Multi-touch
Scratch resistant
Capacitive
Multi-touch
Scratch resistant
Capacitive
Multi-touch
Scratch resistant
Capacitive
Multi-touch
Scratch resistant
Infinity-V Display
2.5D curved glass screen
Infinity-U Display
2.5D curved glass screen
-Corning Gorilla Glass 5
2.5D curved glass screen
LTPS (Low Temperature PolySilicon)
1500:1 contrast ratio
500 cd/m²
85% NTSC

Sensors

Different sensors measure different physical quantities and convert them into signals recognizable by the mobile device.

SensorsProximity
Light
Accelerometer
Compass
Gyroscope
Fingerprint
Hall
Proximity
Light
Accelerometer
Compass
Gyroscope
Fingerprint
Hall
Proximity
Light
Accelerometer
Compass
Gyroscope
Fingerprint
Proximity
Light
Accelerometer
Compass
Gyroscope
Barometer
Fingerprint
Hall
In-display fingerprint sensorIn-display fingerprint sensorIn-display fingerprint sensorFingerprint sensor model - Fingerprint Cards FPC1028

Rear camera

The primary camera of the mobile device is usually placed on its back and can be combined with one or more additional cameras.

Sensor modelSamsung S5K2X5-Samsung S5KGM2Sony IMX486 Exmor RS
Sensor typeISOCELL-ISOCELLCMOS
Sensor format1/2.8"-1/2.25"1/2.9"
Pixel size0.9 µm
0.000900 mm
0.8 µm
0.000800 mm
0.8 µm
0.000800 mm
1.25 µm
0.001250 mm
ISO100 - 800---
Aperturef/1.7f/2f/2f/1.75
Focal length and 35 mm equivalent---4.07 mm
Number of lenses--6-
Flash typeLEDLEDLEDDual LED
Image resolution5760 x 4320 pixels
24.88 MP
8000 x 6000 pixels
48 MP
8000 x 6000 pixels
48 MP
4000 x 3000 pixels
12 MP
Video resolution1920 x 1080 pixels
2.07 MP
1920 x 1080 pixels
2.07 MP
1920 x 1080 pixels
2.07 MP
3840 x 2160 pixels
8.29 MP
Video FPS30 fps30 fps30 fps30 fps
FeaturesAutofocus
Continuous shooting
Digital zoom
Geotagging
Panorama
HDR
Touch focus
Face detection
White balance settings
ISO settings
Exposure compensation
Self-timer
Scene mode
Autofocus
Continuous shooting
Digital zoom
Geotagging
Panorama
HDR
Touch focus
Face detection
White balance settings
ISO settings
Exposure compensation
Self-timer
Scene mode
Autofocus
Continuous shooting
Digital zoom
Digital image stabilization
Geotagging
Panorama
HDR
Touch focus
Face detection
White balance settings
ISO settings
Exposure compensation
Self-timer
Scene mode
Phase detection autofocus (PDAF)
Autofocus
Continuous shooting
Digital zoom
Geotagging
Panorama
HDR
Touch focus
Face detection
White balance settings
ISO settings
Exposure compensation
Self-timer
Scene mode
Phase detection autofocus (PDAF)
CAF
Secondary rear camera - 5 MP (depth-sensing)
Third rear camera - 8MP (ultra-wide)
Secondary rear camera - 8 MP (ultra-wide)
Aperture size - f/2.2 (#2)
Third rear camera - 5 MP (depth-sensing)
Aperture size - f/2.4 (#3)
Fourth rear camera - 5 MP (macro)
Aperture size - f/2.4 (#4)
Pixel size - 1.6 μm (4-in-1 pixel binning)
Sensor type - ISOCELL PLUS
Super Phase Detection
Secondary rear camera - 12 MP (ultra-wide angle)
Aperture size - f/2.2 (#2)
Pixel size - 1.12 μm (#2)
Third rear camera - 5 MP (macro)
Aperture size - f/2.4 (#3)
Fourth rear camera - 5 MP (depth-sensing)
Aperture size - f/2.2 (#3)
Pixel size - 1.12 μm (#3)
720p @ 120 fps
Secondary rear camera - 20 MP
Sensor model - Sony IMX376 Exmor RS (#2)
Sensor type - CMOS BSI (#2)
Sensor size - 1/2.78" (#2)
Pixel size - 2.0 μm (4-in-1 pixel binning) (#2)
Aperture size - f/1.75 (#2)

Front camera

Modern smartphones have one or more front cameras and their positioning has led to various design concepts – pop-up camera, rotating camera, notch, punch hole, under-display camera, etc.

Sensor model--Samsung S5KGD1Sony IMX376 Exmor RS
Sensor typeISOCELL-ISOCELLCMOS BSI
Sensor format--1/2.8"1/2.78"
Pixel size--0.8 µm
0.000800 mm
1 µm
0.001000 mm
Aperturef/2f/2.2f/2.2f/2.2
Focal length and 35 mm equivalent---3.82 mm
Auxiliary light---LED
Image resolution4608 x 3456 pixels
15.93 MP
20 MP6560 x 4928 pixels
32.33 MP
5184 x 3880 pixels
20.11 MP
Video resolution1920 x 1080 pixels
2.07 MP
1920 x 1080 pixels
2.07 MP
1920 x 1080 pixels
2.07 MP
1920 x 1080 pixels
2.07 MP
Video FPS30 fps30 fps30 fps30 fps
Features-Face unlock
HDR
Face unlock-
--Sensor type - ISOCELL SlimPixel size - 2.0 μm (4-in-1 pixel binning)
HDR

Audio

Information about the type of speakers and the audio technologies supported by the device.

SpeakerLoudspeaker
Earpiece
Loudspeaker
Earpiece
Loudspeaker
Earpiece
Loudspeaker
Earpiece
---Headphone adapter

Radio

The radio in a mobile device is a built-in FM radio receiver.

RadioYesYesYesNo

Tracking/Positioning

Information about the positioning and navigation technologies supported by the device.

Tracking/PositioningGPS
A-GPS
GLONASS
BeiDou
GPS
A-GPS
GLONASS
BeiDou
GPS
A-GPS
GLONASS
BeiDou
Galileo
GPS
A-GPS
GLONASS
BeiDou

Wi-Fi

Wi-Fi is a technology that provides wireless data connections between various devices within a short range.

Wi-Fi802.11a
802.11b
802.11g
802.11n
802.11n 5GHz
802.11ac
Dual band
Wi-Fi Hotspot
Wi-Fi Direct
802.11a
802.11b
802.11g
802.11n
802.11n 5GHz
802.11ac
Dual band
Wi-Fi Hotspot
Wi-Fi Direct
802.11a
802.11b
802.11g
802.11n
802.11n 5GHz
802.11ac
Dual band
Wi-Fi Hotspot
Wi-Fi Direct
Wi-Fi Display
802.11a
802.11b
802.11g
802.11n
802.11n 5GHz
802.11ac
Dual band
Wi-Fi Hotspot
Wi-Fi Direct
Wi-Fi Display
---2x2 MiMO

Bluetooth

Bluetooth is a standard for secure wireless data transfer between different types of devices over short distances.

Version5.05.05.05.0
FeaturesA2DP
AVRCP
DIP
HFP
HID
HSP
MAP
OPP
PAN
PBAP
HOGP
A2DP
AVRCP
DIP
HFP
HID
HSP
MAP
OPP
PAN
PBAP
HOGP
A2DP
AVRCP
DIP
HFP
HID
HSP
MAP
OPP
PAN
PBAP
HOGP
A2DP
HID

USB

The Universal Serial Bus (USB) is an industry standard that allows different electronic devices to exchange data.

Connector typeUSB Type-CUSB Type-CUSB Type-CUSB Type-C
Version2.02.02.02.0
FeaturesCharging
Mass storage
On-The-Go
Charging
Mass storage
On-The-Go
Charging
Mass storage
On-The-Go
Charging
Host
Mass storage
On-The-Go

Headphone jack

The headphone jack is an audio phone connector, a.k.a. an audio jack. The most widely used one in mobile devices is the 3.5 mm headphone jack.

Headphone jackYesYesYesNo

Connectivity

Information about other important connectivity technologies supported by the devices.

ConnectivityComputer sync
OTA sync
Tethering
NFC
VoLTE
Computer sync
OTA sync
Tethering
NFC
VoLTE
Computer sync
OTA sync
Tethering
NFC
VoLTE
ANT+
Computer sync
OTA sync
Infrared
Tethering
VoLTE
-Availability of Samsung Pay Service (NFC or MST) may vary by country--

Browser

A web browser is a software application for accessing, fetching, displaying and navigating through information on the World Wide Web.

BrowserHTML
HTML5
CSS 3
HTML
HTML5
CSS 3
HTML
HTML5
CSS 3
HTML
HTML5
CSS 3

Audio file formats/codecs

Mobile devices support various audio file formats and codecs, which respectively store and code/decode digital audio data.

Audio file formats/codecsAAC
AMR
AMR-WB
eAAC+
FLAC
M4A
MIDI
MP3
OGG
WMA
WAV
AAC
AMR
AMR-WB
eAAC+
FLAC
M4A
MIDI
MP3
OGG
WMA
WAV
AAC
AMR
AMR-WB
eAAC+
FLAC
M4A
MIDI
MP3
OGG
WMA
WAV
AAC
AAC+
AC3
AMR
eAAC+
FLAC
MIDI
MP3
OGG
WMA
WAV

Video file formats/codecs

Mobile devices support various video file formats and codecs, which respectively store and code/decode digital video data.

Video file formats/codecs3GPP
3GPP2
AVI
Flash Video
H.263
H.264
H.265
MKV
MP4
VC-1
VP8
VP9
WebM
WMV
WMV7
WMV8
Xvid
3GPP
3GPP2
AVI
Flash Video
H.263
H.264
H.265
MKV
MP4
VC-1
VP8
VP9
WebM
WMV
WMV7
WMV8
Xvid
3GPP
3GPP2
AVI
Flash Video
H.263
H.264
H.265
MKV
MP4
VC-1
VP8
VP9
WebM
WMV
WMV7
WMV8
Xvid
3GPP
AVI
H.263
H.264
H.265
MKV
MP4
VC-1
VP8
Xvid

Battery

The batteries of mobile devices differ in capacity and technology. They provide the electrical charge needed for the functioning of the devices.

Capacity4000 mAh5000 mAh4000 mAh3010 mAh
TypeLi-IonLi-IonLi-IonLi-Polymer
Charger output power5 V / 2 A
9 V / 1.67 A
5 V / 2 A
9 V / 1.67 A
5 V / 2 A
9 V / 1.67 A
5 V / 2 A
Quick charge technology---Qualcomm Quick Charge 3.0
FeaturesFast charging
Non-removable
Fast charging
Non-removable
Fast charging
Non-removable
Fast charging
Non-removable

Specific Absorption Rate (SAR)

The SAR rating shows the amount of electromagnetic radiation absorbed by the human body when using a mobile device, expressed in W/kg.

Head SAR (EU)1.05 W/kg0.488 W/kg0.369 W/kg0.963 W/kg
Body SAR (EU)1.54 W/kg1.68 W/kg1.59 W/kg0.639 W/kg
Head SAR (USA)--0.8 W/kg1.16 W/kg
Body SAR (USA)--0.67 W/kg0.66 W/kg

Additional features

Some devices have additional features, different from the standard ones above, but equally important and worth mentioning.

Additional features---M1804D2SI - SAR (Specific Absorption Rate) India: head - 1.092 W/kg; body - 0.259 W/kg
 Samsung Galaxy A30sSamsung Galaxy A31Samsung Galaxy A51Xiaomi Mi A2