Samsung Galaxy J7 (2018) vs Samsung Galaxy A21
Compare phone and tablet specifications of up to three devices. Type a model name in the search field of our phone specs comparison tool or pick a popular device from the ones below.
Display
Size
Resolution
Technology
TFT
IPS LCD
Screen-to-body
71.45 %
79.20 %
Features
Scratch-resistant glass (Corning Gorilla Glass 5), Ambient light sensor, Proximity sensor
Ambient light sensor, Proximity sensor
Hardware
System chip
Samsung Exynos 7 Octa 7870
Mediatek Helio P35
Processor
GPU
Mali-T830 MP1
PowerVR GE8320
RAM
Internal storage
32GB
32GB (eMMC 5.1), available to use: 19.8 GB
Storage expansion
microSDXC up to 400 GB
microSDXC up to 512 GB
Device type
Smartphone
Smartphone
OS
Android (8.0 Oreo)
Android (10), Samsung One UI
Battery
Capacity
3300 mAh
4000 mAh
Type
Not user replaceable
Li - Polymer, Not user replaceable
Charging
Fast charging
Max charge speed
Wired: 15.0W
Camera
Rear
Single camera
Quad camera
Main camera
Specifications
Aperture size: F1.7; Focal length: 28 mm; Sensor size: 1/3.06"; Pixel size: 1.12 μm
Aperture size: F1.8; Sensor size: 1/3.06"; Pixel size: 1 μm
Second camera
8 MP (Ultra-wide)
Specifications
Aperture size: F2.2; Sensor size: 1/4"; Pixel size: 1.12 μm
Third camera
2 MP (Macro)
Specifications
Aperture size: F2.4
Fourth camera
2 MP (Depth information)
Specifications
Aperture size: F2.4
Video recording
1920x1080 (Full HD) (30 fps)
1920x1080 (Full HD) (30 fps)
Features
Video calling, Video sharing
Front
13 MP
13 MP
Design
Dimensions
Weight
the average is 6.3 oz (179 g)
the average is 6.3 oz (179 g)
Materials
Back: Plastic
Back: Plastic; Frame: Plastic
Biometrics
2D Face unlock
Fingerprint (touch)
Features
Touch sensitive control keys
Keys
Left: Volume control; Right: Lock/Unlock key
Right: Volume control, Lock/Unlock key
Colors
Black
Black
Cellular
LTE (FDD)
Bands 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 12(700 a), 14(700 PS)
Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 13(700 c), 17(700 b), 20(800 DD), 25(1900+), 26(850+), 28(700 APT), 66(AWS-3), 71(600)
LTE (TDD)
Bands 38(2600), 39(1900+), 40(2300), 41(2600+)
UMTS
850, 1900, 2100 MHz
850, 900, 1700/2100, 1900, 2100 MHz
Data Speed
SIM type
Nano SIM
Nano SIM
HD Voice
Yes
Yes
Multimedia
Headphones
3.5mm jack
3.5mm jack
Speakers
Earpiece, Loudspeaker
Earpiece, Loudspeaker
Features
Album art cover, Background playback
Screen mirroring
Wireless screen share
Wireless screen share
Radio
FM
Connectivity & Features
Bluetooth
4.2
5.0
Wi-Fi
802.11 a, b, g, n, ac, dual-band; Wi-Fi Direct, Hotspot
802.11 a, b, g, n, ac, dual-band; Wi-Fi Direct, Hotspot
USB
microUSB, USB 2.0
Type-C (reversible), USB 2.0
Features
Charging, Mass storage device
Charging
Location
GPS, A-GPS, Glonass
GPS, A-GPS, Glonass, BeiDou, Cell ID, Wi-Fi positioning
Sensors
Accelerometer, Gyroscope, Compass
Accelerometer, Gyroscope, Compass
Other
ANT+, UMA (Wi-Fi Calling), VoIP, Tethering, Computer sync, OTA sync
NFC
Hearing aid compatible
M3, T3
M4, T3
Regulatory Approval
FCC approval
Date approved
Apr 24, 2018
Apr 17, 2020
Measured SAR
Head
1.03 W/kg
0.42 W/kg
Body
0.76 W/kg
1.27 W/kg
Simultaneous Transmission
1.58 W/kg
1.27 W/kg
Wireless Router
0.98 W/kg
1.27 W/kg
Phablet
3.58 W/kg
Buyers information
Price
$ 230
$ 250
Availability
Officially announced
Jun 07, 2018
Apr 08, 2020
