Comparison between:
- Samsung Galaxy A31
- Samsung Galaxy A51
- Samsung Galaxy S9+ Exynos

Brand and model

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

Samsung Galaxy A31Samsung Galaxy A51Samsung Galaxy S9+ Exynos
Samsung Galaxy A31
Prices
Samsung Galaxy A51
Prices
Samsung Galaxy S9+ Exynos
Prices
Model aliasSM-A315FSM-A515F/DS
SM-A515F/DSN
SM-A515FN/DS
SM-A515GN/DS
SM-A515FM/DS
SM-A515YN
SM-A515W
Galaxy S9 Plus Exynos
SM-G965F
G965FSM-G965FD
G965FD
SM-G965N
G965N

Design

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

Width73.1 mm
7.31 cm
0.24 ft
2.878 in
73.6 mm
7.36 cm
0.241 ft
2.898 in
73.8 mm
7.38 cm
0.242 ft
2.906 in
Height159.3 mm
15.93 cm
0.523 ft
6.272 in
158.5 mm
15.85 cm
0.52 ft
6.24 in
158.1 mm
15.81 cm
0.519 ft
6.224 in
Thickness8.6 mm
0.86 cm
0.028 ft
0.339 in
7.9 mm
0.79 cm
0.026 ft
0.311 in
8.5 mm
0.85 cm
0.028 ft
0.335 in
Weight185 g
0.41 lbs
6.53 oz
172 g
0.38 lbs
6.07 oz
189 g
0.42 lbs
6.67 oz
Volume100.15 cm³
6.08 in³
92.16 cm³
5.6 in³
99.18 cm³
6.02 in³
ColorsPrism Crush Black
Prism Crush Blue
Prism Crush Red
Prism Crush White
Prism Crush Blue
Prism Crush Black
Prism Crush Pink
Prism Crush White
Black
Lilac
Gray
Blue
Gold
Red
Body materialsPlasticPlasticGlass
Aluminium alloy
Certification--IP68

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-SIM
Number of SIM cards221
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 optional (A variant of the model with two SIM card slots is available)

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
GSM 900 MHz
GSM 1800 MHz
GSM 1900 MHz
TD-SCDMA--TD-SCDMA 1880-1920 MHz
TD-SCDMA 2010-2025 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
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 1800 MHz (B3)
LTE-FDD 2100 MHz (B1)
LTE-FDD 2600 MHz (B7)
LTE-TDD 1900 MHz (B39)
LTE-TDD 2300 MHz (B40)
LTE-TDD 2500 MHz (B41)
LTE-TDD 2600 MHz (B38)
LTE 700 MHz Class 13
LTE 700 MHz Class 17
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 700 MHz (B12)
LTE 700 MHz (B28)

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 12
UMTS
EDGE
GPRS
HSPA+
LTE Cat 18
TD-SCDMA
TD-HSDPA

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 10Android 10Android 8.0 Oreo
Android 9.0 Pie
User interface (UI)One UI 2.0One UI 2.0Experience 9.0
One

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.

SoCMediaTek Helio G70Samsung Exynos 7 Octa 9611Samsung Exynos 9 9810
Process technology12 nm10 nm10 nm
CPU2x 2.0 GHz Cortex-A75, 6x 1.7 GHz Cortex-A554x 2.3 GHz ARM Cortex-A73, 4x 1.7 GHz ARM Cortex-A534x 2.7 GHz Exynos M3 Mongoose, 4x 1.79 GHz ARM Cortex-A55
CPU bits64 bit64 bit64 bit
Instruction setARMv8-AARMv8-AARMv8-A
Level 3 cache memory (L3)--4096 KB
4 MB
CPU cores888
CPU frequency2000 MHz2300 MHz2700 MHz
GPUARM Mali-G52 2EEMC2ARM Mali-G72 MP3ARM Mali-G72 MP18
GPU cores-318
GPU frequency820 MHz-572 MHz
RAM capacity4 GB
6 GB
4 GB
6 GB
8 GB
6 GB
RAM typeLPDDR4XLPDDR4XLPDDR4X
RAM channelsDouble channelDouble channelDouble channel
RAM frequency--1794 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
256 GB
eMMC 5.1-UFS 2.1

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 AMOLED
Diagonal size6.4 in
162.56 mm
16.26 cm
6.5 in
165.1 mm
16.51 cm
6.2 in
157.48 mm
15.75 cm
Width2.63 in
66.71 mm
6.67 cm
2.67 in
67.75 mm
6.78 cm
2.71 in
68.89 mm
6.89 cm
Height5.84 in
148.24 mm
14.82 cm
5.93 in
150.56 mm
15.06 cm
5.58 in
141.61 mm
14.16 cm
Aspect ratio2.222:12.222:12.056:1
Resolution1080 x 2400 pixels1080 x 2400 pixels1440 x 2960 pixels
Pixel density411 ppi
161 ppcm
405 ppi
159 ppcm
531 ppi
208 ppcm
Color depth24 bit
16777216 colors
24 bit
16777216 colors
24 bit
16777216 colors
Display area85.2 %87.72 %83.88 %
Other featuresCapacitive
Multi-touch
Scratch resistant
Capacitive
Multi-touch
Scratch resistant
Capacitive
Multi-touch
Scratch resistant
Infinity-U Display
2.5D curved glass screen
-Corning Gorilla Glass 5
Dual Edge display
Always-On Display
VR headset support
HDR10

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
Proximity
Light
Accelerometer
Compass
Gyroscope
Barometer
Fingerprint
Hall
Heart rate
Iris sensor
In-display fingerprint sensorIn-display fingerprint sensor-

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 model-Samsung S5KGM2Samsung SAK2L3
Sensor type-ISOCELLISOCELL
Sensor format-1/2.25"1/2.55"
Pixel size0.8 µm
0.000800 mm
0.8 µm
0.000800 mm
1.4 µm
0.001400 mm
Aperturef/2f/2f/1.5 - 2.4
Focal length and 35 mm equivalent--4.3 mm
26 mm *(35 mm / full frame)
Field of view--77 °
Number of lenses-6-
Flash typeLEDLEDDual LED
Image resolution8000 x 6000 pixels
48 MP
8000 x 6000 pixels
48 MP
4032 x 3024 pixels
12.19 MP
Video resolution1920 x 1080 pixels
2.07 MP
1920 x 1080 pixels
2.07 MP
3840 x 2160 pixels
8.29 MP
Video 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
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
Optical zoom
Optical image stabilization
Geotagging
Panorama
HDR
Touch focus
Face detection
White balance settings
ISO settings
Exposure compensation
Self-timer
Scene mode
Phase detection autofocus (PDAF)
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)
Phase detection with Dual Pixel
Object tracking AF
Smart OIS
High CRI LED flash
2160p @ 60 fps
1080p @ 240 fps
720p @ 960 fps
Secondary rear camera - 12 MP (telephoto)
Pixel size - 1.0 μm (#2)
Aperture size - f/2.4 (#2)
Focal length (35 mm equivalent) - 52 mm (#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 S5KGD1Samsung S5K3H1
Sensor type-ISOCELL-
Sensor format-1/2.8"1/3.6"
Pixel size-0.8 µm
0.000800 mm
1.22 µm
0.001220 mm
Aperturef/2.2f/2.2f/1.7
Focal length and 35 mm equivalent--2.92 mm
25 mm *(35 mm / full frame)
Field of view--80 °
Image resolution20 MP6560 x 4928 pixels
32.33 MP
3264 x 2448 pixels
7.99 MP
Video resolution1920 x 1080 pixels
2.07 MP
1920 x 1080 pixels
2.07 MP
2560 x 1440 pixels
3.69 MP
Video FPS30 fps30 fps30 fps
FeaturesFace unlock
HDR
Face unlock-
-Sensor type - ISOCELL SlimAuto HDR

Audio

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

SpeakerLoudspeaker
Earpiece
Loudspeaker
Earpiece
Loudspeaker
Earpiece
--384 kHz / 32-bit
Dolby Atmos

Radio

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

RadioYesYesNo

Tracking/Positioning

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

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

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
Wi-Fi Display
802.11a
802.11b
802.11g
802.11n
802.11n 5GHz
802.11ac
Dual band
Wi-Fi Hotspot
Wi-Fi Direct
--VHT80 MU-MiMO
1024-QAM

Bluetooth

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

Version5.05.05.0
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
LE
MAP
OPP
PAN
PBAP

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-C
Version2.02.03.1
FeaturesCharging
Mass storage
On-The-Go
Charging
Mass storage
On-The-Go
Charging
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 jackYesYesYes

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
ANT+
Computer sync
OTA sync
Tethering
NFC
ANT+
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

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
AAC+
AMR
AMR-WB
aptX
eAAC+
FLAC
M4A
MIDI
MP3
OGG
WMA
WAV
XMF
LDAC

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
DivX
Flash Video
H.263
H.264
MKV
MP4
WebM
WMV
Xvid
ASF

Battery

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

Capacity5000 mAh4000 mAh3500 mAh
TypeLi-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
FeaturesFast charging
Non-removable
Fast charging
Non-removable
Wireless charging
Fast charging
Non-removable
--Qi/PMA wireless charging

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)0.488 W/kg0.369 W/kg0.294 W/kg
Body SAR (EU)1.68 W/kg1.59 W/kg1.35 W/kg
Head SAR (USA)-0.8 W/kg0.23 W/kg
Body SAR (USA)-0.67 W/kg0.58 W/kg
 Samsung Galaxy A31Samsung Galaxy A51Samsung Galaxy S9+ Exynos