Phone Comparison - Samsung Galaxy J7 (2017) vs Samsung Galaxy A31 vs Samsung Galaxy A21

general General Info

Manufacturer Samsung Samsung Samsung
Announced June 2017 2020, March 24 2020, April 8
Status Available - July 2017 Coming Soon - April 2020 Coming soon. Exp. release 2020, April
Price Rs. 24,500 ($330.00) [Similarly Priced] - -
Colors Gold, Black, Pink, Blue Prism Crush Black, Prism Crush Blue, Prism Crush Red, Prism Crush White Various
Form Factor Candybar Candybar Candybar
Dimension 152.4 x 74.7 x 7.9 mm
(6 x 2.94 x 0.31 in)
159.3 x 73.1 x 8.6 mm
(6.27 x 2.88 x 0.34 in)
-
Weight - 185 g (6.53 oz) -
SIM Type Dual SIM (Nano-SIM, dual stand-by) Single SIM (Nano-SIM), Dual SIM (Nano-SIM, dual stand-by) Single SIM (Nano-SIM), Dual SIM (Nano-SIM, dual stand-by)
2G Network GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM model only) GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM model only) GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM only)
3G Network HSDPA 850 / 900 / 1900 / 2100 - J710F, J710H
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 - J710M
HSDPA 850 / 900 / 1900 / 2100 HSDPA 850 / 900 / 1900 / 2100
HSDPA 850 / 1700(AWS) / 1900 / 2100
4G Network LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 20(800), 40(2300) - J710F LTE (unspecified) LTE
Messaging SMS, MMS, EMail, IM
Build Features - - Fingerprint Sensor (under display, optical)
- Fingerprint Sensor
Glass front, plastic back, plastic frame

hardware Hardware and OS

OS Android OS, v7.1 (Nougat) Android 10.0 Android 10.0
User Interface - One UI 2.0 One UI 2.0
Processor Octa-core 1.6 GHz Cortex-A53, Exynos 7870 Octa-core (2x2.0 GHz Cortex-A75 & 6x1.7 GHz Cortex-A55), Mediatek MT6768 Helio P65 (12nm) Octa-core (4x2.35 GHz Cortex-A53 & 4x1.8 GHz Cortex-A53), Mediatek MT6765 Helio P35 (12nm)
GPU Mali-T830 MP2 Mali-G52 MC2 PowerVR GE8320
RAM 3 GB 6 GB 3 GB
Internal Memory 16 GB 128 GB 64 GB
External Memory microSD, up to 256 GB microSDXC microSDXC (dedicated slot)

display Display

Type Super AMOLED capacitive touchscreen, 2.5D Gorilla Glass Super AMOLED Capacitive Touchscreen HD+ Super AMOLED Capacitive Touchscreen
Colors 16M colors 16M colors 16M colors
Size 5.5 inches 6.4 inches 6.5 inches
Resolution 1080 x 1920 pixels (401 ppi) 1080 x 2400 pixels (411 ppi) 720 x 1600 pixels (270 ppi)
Screen-to-Body Ratio 73.08% 85.01% -
Multi-Touch yes yes yes

multimedia Multimedia

3.5mm Jack yes yes yes
Radio FM radio, RDS, recording - FM radio
Games Yes + Downloadable Yes + Downloadable Yes + Downloadable
Loud Speaker yes yes yes

camera Camera

Rear Camera 13 MP 48 MP + 8 MP + 5 MP + 5 MP 16 MP + 8 MP + 2 MP + 2 MP
Flash LED Flash LED flash No
Features Autofocus, f/1.7, 28mm, Geo-tagging, Touch Focus, Face Detection, Panorama, HDR 48 MP, f/2.0, (wide), 1/2.0", 0.8µm, PDAF
8 MP, f/2.2, 13mm (ultrawide), 1/4.0", 1.12µm
5 MP, f/2.4, (macro)
5 MP, f/2.4, (depth)
panorama, HDR
16 MP, f/1.9, 28mm (wide), AF
8 MP, f/2.2, 12mm (ultrawide)
2 MP, (macro)
2 MP, (depth)
panorama, HDR
Video 1080p@30fps 1080p@30fps 1080p@30fps
Front Camera 13 MP, f/1.9 [Similar] 20 MP, f/2.2, 0.8µm
HDR
1080p@30fps [Similar]
13 MP
HDR
1080p@30fps [Similar]

connectivity Connectivity and Data Rate

GPRS Yes Yes Yes
Edge Yes Yes Yes
3G HSPA, LTE Cat4 150/50 Mbps HSPA, LTE-A HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps
Bluetooth v4.1, A2DP 5.0, A2DP, LE 5.0, A2DP, LE
Wi-Fi Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot
USB microUSB v2.0 2.0, Type-C 1.0 reversible connector, USB On-The-Go 2.0, Type-C 1.0 reversible connector, USB On-The-Go
GPS Yes, with A-GPS, GLONASS Yes, with A-GPS, GLONASS, GALILEO, BDS Yes, with A-GPS, GLONASS, BDS
Browser HTML5 Yes Yes

memory User Memory

Internal 16 GB, 3 GB RAM 128 GB, 6 GB RAM or 64 GB, 4 GB RAM (UFS 2.1) 64 GB, 3 GB RAM eMMC 5.1
Expandable Storage microSD, up to 256 GB microSDXC microSDXC (dedicated slot)
USB OTG Supported Supported Supported

Apps Sensors

Fingerprint fingerprint supported fingerprint supported fingerprint supported
Proximity Sensor proximity sensor present proximity sensor present proximity sensor present
Accelerometer Sensor accelerometer sensor present accelerometer sensor present accelerometer sensor present
Magnetic-Field Sensor (Compass) magnetic field sensor present magnetic field sensor present magnetic field sensor present
Gyroscope Sensor gyroscope sensor present gyroscope sensor present gyroscope sensor present
NFC NFC supported NFC not supported NFC not supported

battery Battery

Type Non-removable Li-Ion Battery Non-removable Li-Po Battery
Fast battery charging 15W
Non-removable Li-Po Battery
Fast battery charging 15W
Capacity 3600 mAh 5000 mAh 4000 mAh
Stand by - - -
Talk Time - - -