Comparison between:
- Samsung Galaxy A21s
- Samsung Galaxy A31
- Samsung Galaxy A11
- Samsung Galaxy A51

Brand and model

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

Samsung Galaxy A21sSamsung Galaxy A31Samsung Galaxy A11Samsung Galaxy A51
Samsung Galaxy A21s
Prices
Samsung Galaxy A31
Prices
Samsung Galaxy A11
Prices
Samsung Galaxy A51
Prices
Model aliasSM-A217F
SM-A217F/DS
SM-A315FSM-A115F/DS
SM-A115F
A115F
SM-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.

Width75.3 mm
7.53 cm
0.247 ft
2.965 in
73.1 mm
7.31 cm
0.24 ft
2.878 in
76.3 mm
7.63 cm
0.25 ft
3.004 in
73.6 mm
7.36 cm
0.241 ft
2.898 in
Height163.7 mm
16.37 cm
0.537 ft
6.445 in
159.3 mm
15.93 cm
0.523 ft
6.272 in
161.4 mm
16.14 cm
0.53 ft
6.354 in
158.5 mm
15.85 cm
0.52 ft
6.24 in
Thickness8.9 mm
0.89 cm
0.029 ft
0.35 in
8.6 mm
0.86 cm
0.028 ft
0.339 in
8 mm
0.8 cm
0.026 ft
0.315 in
7.9 mm
0.79 cm
0.026 ft
0.311 in
Weight192 g
0.42 lbs
6.77 oz
185 g
0.41 lbs
6.53 oz
177 g
0.39 lbs
6.24 oz
172 g
0.38 lbs
6.07 oz
Volume109.71 cm³
6.66 in³
100.15 cm³
6.08 in³
98.52 cm³
5.98 in³
92.16 cm³
5.6 in³
ColorsBlack
White
Blue
Red
Prism Crush Black
Prism Crush Blue
Prism Crush Red
Prism Crush White
Black
White
Red
Blue
Prism Crush Blue
Prism Crush Black
Prism Crush Pink
Prism Crush White
Body materialsPlasticPlasticPlasticPlastic

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 cards1222
FeaturesDual 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)
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 (B5)
GSM 900 MHz (B8)
GSM 1800 MHz (B3)
GSM 1900 MHz (B2)
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 (B5)
UMTS 900 MHz (B8)
UMTS 1900 MHz (B2)
UMTS 2100 MHz (B1)
LTELTE-FDD 800 MHz (B20)
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 2300 MHz (B40)
LTE-TDD 2500 MHz (B41)
LTE-TDD 2600 MHz (B38)
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 800 MHz (B20)
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-FDD 850 MHz (B5)
LTE-FDD 900 MHz (B8)
LTE-FDD 1800 MHz (B3)
LTE-FDD 2100 MHz (B1)
LTE-FDD 2600 MHz (B7)

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
HSPA+
LTE Cat 4
UMTS
EDGE
GPRS
HSPA+
LTE Cat 10
UMTS
EDGE
HSPA+
LTE Cat 4
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 10Android 10Android 10Android 10
User interface (UI)One UI 2.0One UI 2.0One 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 850 (S5E3830)MediaTek Helio G70Qualcomm Snapdragon 450Samsung Exynos 7 Octa 9611
Process technology8 nm12 nm14 nm10 nm
CPU4x 2.0 GHz Cortex-A55 cores, 4x Cortex-A55 cores2x 2.0 GHz Cortex-A75, 6x 1.7 GHz Cortex-A55ARM Cortex-A534x 2.3 GHz ARM Cortex-A73, 4x 1.7 GHz ARM Cortex-A53
CPU bits64 bit64 bit64 bit64 bit
Instruction setARMv8-AARMv8-AARMv8ARMv8-A
CPU cores8888
CPU frequency2000 MHz2000 MHz1800 MHz2300 MHz
GPUARM Mali-G52ARM Mali-G52 2EEMC2Qualcomm Adreno 506ARM Mali-G72 MP3
GPU cores---3
GPU frequency-820 MHz--
RAM capacity3 GB
4 GB
6 GB
4 GB
6 GB
2 GB
3 GB
4 GB
6 GB
8 GB
RAM typeLPDDR4XLPDDR4X-LPDDR4X
RAM channelsDouble channelDouble channel-Double channel
RAM frequency1866 MHz---

Storage

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

Storage32 GB
64 GB
64 GB
128 GB
32 GB64 GB
128 GB
eMMC 5.1eMMC 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
microSD
microSDHC
microSDXC

Display

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

Type/technologyPLSSuper AMOLEDTFTSuper AMOLED
Diagonal size6.5 in
165.1 mm
16.51 cm
6.4 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
Width2.67 in
67.75 mm
6.78 cm
2.63 in
66.71 mm
6.67 cm
2.68 in
68.12 mm
6.81 cm
2.67 in
67.75 mm
6.78 cm
Height5.93 in
150.56 mm
15.06 cm
5.84 in
148.24 mm
14.82 cm
5.81 in
147.6 mm
14.76 cm
5.93 in
150.56 mm
15.06 cm
Aspect ratio2.222:12.222:12.167:12.222:1
Resolution720 x 1600 pixels1080 x 2400 pixels720 x 1560 pixels1080 x 2400 pixels
Pixel density270 ppi
106 ppcm
411 ppi
161 ppcm
268 ppi
105 ppcm
405 ppi
159 ppcm
Color depth24 bit
16777216 colors
24 bit
16777216 colors
24 bit
16777216 colors
24 bit
16777216 colors
Display area83.02 %85.2 %81.91 %87.72 %
Other featuresCapacitive
Multi-touch
Scratch resistant
Capacitive
Multi-touch
Scratch resistant
Capacitive
Multi-touch
Capacitive
Multi-touch
Scratch resistant
Infinity-O DisplayInfinity-U Display
2.5D curved glass screen
Infinity-O display-

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
Fingerprint
Proximity
Light
Accelerometer
Compass
Gyroscope
Fingerprint
-In-display fingerprint sensor-In-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 S5KGM2
Sensor typeCMOS--ISOCELL
Sensor format---1/2.25"
Pixel size-0.8 µm
0.000800 mm
-0.8 µm
0.000800 mm
Aperturef/2f/2f/1.8f/2
Number of lenses---6
Flash typeLEDLEDLEDLED
Image resolution8000 x 6000 pixels
48 MP
8000 x 6000 pixels
48 MP
4160 x 3120 pixels
12.98 MP
8000 x 6000 pixels
48 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
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
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)
Secondary rear camera - 8 MP (ultra-wide angle)
Aperture size - f/2.2 (#2)
Third rear camera - 2 MP (macro)
Aperture size - f/2.4 (#3)
Fourth rear camera - 2 MP (depth-sensing)
Aperture size - f/2.4 (#4)
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)
Secondary rear camera - 2 MP (depth sensing)
Aperture size - f/2.4 (#2)
Third rear camera - 5 MP (ultra-wide angle)
Aperture size - f/2.2 (#3)
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)

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 S5KGD1
Sensor type---ISOCELL
Sensor format1/3.1"--1/2.8"
Pixel size1.12 µm
0.001120 mm
--0.8 µm
0.000800 mm
Aperturef/2.2f/2.2-f/2.2
Focal length and 35 mm equivalent2.61 mm
25 mm *(35 mm / full frame)
---
Image resolution4160 x 3120 pixels
12.98 MP
20 MP3264 x 2448 pixels
7.99 MP
6560 x 4928 pixels
32.33 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
FeaturesFace unlockFace unlock
HDR
Face unlockFace unlock
---Sensor type - ISOCELL Slim

Audio

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

SpeakerLoudspeaker
Earpiece
Loudspeaker
Earpiece
Loudspeaker
Earpiece
Loudspeaker
Earpiece

Radio

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

RadioYesYesYesYes

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

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
AVRCP
DIP
HFP
HID
HSP
MAP
OPP
PAN
PBAP
HOGP

USB

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

Connector typeUSB Type-CUSB Type-CMicro USBUSB 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
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 jackYesYesYesYes

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
VoLTE
ANT+
Computer sync
OTA sync
Tethering
NFC
VoLTE
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
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
AMR
AMR-WB
eAAC+
FLAC
M4A
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
3GPP2
AVI
Flash Video
H.263
H.264
H.265
MKV
MP4
VC-1
VP8
VP9
WebM
WMV
WMV7
WMV8
Xvid

Battery

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

Capacity5000 mAh5000 mAh4000 mAh4000 mAh
TypeLi-PolymerLi-IonLi-IonLi-Ion
Charger output power5 V / 2 A
9 V / 1.67 A
5 V / 2 A
9 V / 1.67 A
5 V / 3 A5 V / 2 A
9 V / 1.67 A
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)0.23 W/kg0.488 W/kg0.52 W/kg0.369 W/kg
Body SAR (EU)1.38 W/kg1.68 W/kg0.99 W/kg1.59 W/kg
Head SAR (USA)---0.8 W/kg
Body SAR (USA)---0.67 W/kg
 Samsung Galaxy A21sSamsung Galaxy A31Samsung Galaxy A11Samsung Galaxy A51