Samsung Galaxy J7 (2017) vs Samsung Galaxy A21 Specs Comparison

Design

Dimensions
6.00 x 2.94 x 0.31 inches 152.5 x 74.8 x 8 mm	6.61 x 3.02 x 0.32 inches 167.8 x 76.7 x 8.1 mm
Weight
6.38 oz (181.0 g)	6.81 oz (193.0 g)
Materials
Back: Aluminum	Back: Plastic Frame: Plastic
Biometrics
Fingerprint (touch)	Fingerprint (touch)
Features
Touch sensitive control keys
Keys
Left: Volume control; Right: Lock/Unlock key	Right: Volume control, Lock/Unlock key
Colors
Black, Gold, Silver, Rose gold	Black

Display

Size
5.5-inch	6.5-inch
Resolution
1920x1080px, 401 PPI	1600x720px, 20:9 ratio, 270 PPI
Technology
Super AMOLED	IPS LCD
Refresh rate
	60Hz
Screen-to-body
73.28 %	79.20 %
Features
Ambient light sensor, Proximity sensor	Ambient light sensor, Proximity sensor

Hardware

System chip
Samsung Exynos 7 Octa 7870 (14 nm)	Mediatek Helio P35 MT6765 (12 nm)
Processor
Octa-core ARM Cortex-A53	Octa-core 4x 2.3GHz Cortex-A53 + 4x 1.8GHz Cortex-A53
GPU
Mali-T830 MP2	PowerVR GE8320
RAM
3GB (LPDDR3)	3GB (LPDDR4)
Internal storage
16GB	32GB (eMMC 5.1), available to use: 19.8 GB
Storage expansion
microSDXC up to 256 GB	microSDXC up to 512 GB
OS
Android (7.0 Nougat), Samsung One UI	Android (10), Samsung One UI

Battery

Capacity
3600 mAh	4000 mAh
Type
	Li - Polymer
Charging
	Fast charging
Charge speed
	Wired: 15.0W

Camera

Rear
Single camera	Quad camera
Main camera
13 MP (Autofocus) Aperture size: F1.7	16 MP (PDAF) Aperture size: F1.8 Sensor size: 1/3.06" Pixel size: 1 μm
Second camera
	8 MP (Ultra-wide) Aperture size: F2.2 Sensor size: 1/4" Pixel size: 1.12 μm
Third camera
	2 MP (Macro) Aperture size: F2.4
Fourth camera
	2 MP (Depth information) Aperture size: F2.4
Flash
LED	LED
Video recording
1920x1080 (Full HD) (30 fps) Video calling, Video sharing	1920x1080 (Full HD) (30 fps)
Front
13 MP (Flash), Video capture: 1920x1080 (Full HD)	13 MP, Video capture: 1920x1080 (Full HD)

Connectivity & Features

Bluetooth
4.1	5.0
WLAN
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, USB 2.0
Hearing aid compatible
	M4/T3
Location
GPS, A-GPS, Glonass, BeiDou	GPS, A-GPS, Glonass, BeiDou, Cell ID, Wi-Fi positioning
Sensors
Accelerometer, Gyroscope, Compass, Hall (for flip covers)	Accelerometer, Gyroscope, Compass
Other
NFC, ANT+, UMA (Wi-Fi Calling), Tethering, Computer sync, OTA sync	NFC

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	FM

Cellular

4G (FDD)
Bands 1(2100), 3(1800), 5(850), 7(2600), 8(900), 20(800 DD)	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)
4G (TDD)
Bands 40(2300)	Bands 38(2600), 39(1900+), 40(2300), 41(2600+)
3G
Bands 1(2100), 2(1900), 5(850), 8(900)	Bands 1(2100), 2(1900), 4(1700/2100), 5(850), 8(900)
Data Speed
LTE-A Cat 6 (300/50 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s	LTE-A Cat 6 (300/50 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
SIM type
Nano SIM	Nano SIM
HD Voice
	Yes
VoLTE
Yes

Regulatory Approval

FCC approval
	Date approved: Apr 17, 2020 FCC ID value: ZCASMA215U
Measured SAR
	Head: 0.42 W/kg Body: 1.27 W/kg Simultaneous Transmission: 1.27 W/kg Wireless Router: 1.27 W/kg

Buyers information

MSRP
	$ 250
In The Box
	This is the official Samsu​ng Galaxy A21 User Guide in English provided from the manufacturer.

Availability

Officially announced
Jun 06, 2017	Apr 08, 2020

Alternative variants

Dual SIM	Yes

for Verizon

4G (FDD)	Bands 1(2100), 2(1900), 3(1800), 5(850), 7(2600), 8(900), 20(800 DD), 28(700 APT)
4G (TDD)	Bands 38(2600), 40(2300), 41(2600+)
3G	Bands 5(850), 8(900), 2(1900), 1(2100)

for Sprint

4G (FDD)	Bands 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 12(700 a), 13(700 c), 25(1900+), 26(850+), 66(AWS-3), 71(600)
4G (TDD)	Bands 41(2600+)

Links

Full specifications
Samsung Galaxy J7 (2017) Specs	Samsung Galaxy A21 Specs
User Reviews
	Samsung Galaxy A21 User Reviews