Samsung Galaxy J7 Perx 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

5.5 inches
6.5 inches

Resolution

1280 x 720 pixels,
267 PPI
1600 x 720 pixels, 20:9 ratio,
270 PPI

Technology

TFT
IPS LCD

Screen-to-body

73.03 %
79.20 %

Features

Proximity sensor
Ambient light sensor, Proximity sensor

Hardware

System chip

Qualcomm Snapdragon 625 8953
Mediatek Helio P35

Processor

Octa-core, 2200 MHz, ARM Cortex-A53, 64-bit, 14 nm
Octa-core, 2300 MHz, Arm Cortex-A53, 64-bit, 12 nm

GPU

Adreno 506
PowerVR GE8320

RAM

2GB LPDDR3
3GB LPDDR4

Internal storage

16GB
32GB (eMMC 5.1), available to use: 19.8 GB

Storage expansion

microSDXC up to 128 GB
microSDXC up to 512 GB

OS

Android (7.0 Nougat)
Android (10), Samsung One UI

Battery

Capacity

3300 mAh
4000 mAh

Type

Li - Ion, User replaceable
Li - Polymer, Not user replaceable

Charging

 
Fast charging

Max charge speed

 
Wired: 15.0W

Camera

Rear

Single camera
Quad camera

Main camera

8 MP (Autofocus, CMOS image sensor)
16 MP (PDAF)

Specifications

 
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

5 MP
13 MP

Design

Dimensions

5.9 x 3 x 0.3 inches (149.9 x 76.2 x 7.6 mm)
6.61 x 3.02 x 0.32 inches (167.8 x 76.7 x 8.1 mm)

Weight

5.90 oz (167.3 g)
the average is 6.2 oz (176 g)
6.81 oz (193.0 g)
the average is 6.2 oz (176 g)

Materials

 
Back: Plastic; Frame: Plastic

Biometrics

 
Fingerprint (touch)

Features

Touch sensitive control keys
 

Colors

Black
Black

Cellular

LTE (FDD)

Bands 2(1900), 4(AWS-1), 5(850), 12(700 a), 25(1900+), 26(850+)
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 41(2600+)
Bands 38(2600), 39(1900+), 40(2300), 41(2600+)

UMTS

850, 900, 1700/2100, 1900, 2100 MHz
850, 900, 1700/2100, 1900, 2100 MHz

Data Speed

LTE, HSPA, UMTS
LTE-A Cat 6 (300/50 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s

SIM type

 
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
FM

Connectivity & Features

Bluetooth

4.2
5.0

Wi-Fi

802.11 a, b, g, n, ac, dual-band; Hotspot, Wi-Fi Direct
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

Mass storage device, Charging
Charging

Location

GPS, A-GPS, Glonass
GPS, A-GPS, Glonass, BeiDou, Cell ID, Wi-Fi positioning

Sensors

Accelerometer, Gyroscope, Compass, Hall (for flip covers), Barometer
Accelerometer, Gyroscope, Compass

Other

ANT+, VoIP, Tethering, Computer sync, OTA sync
NFC

Phone features

Notifications

Haptic feedback
 

Other features

Voice dialing, Voice commands, Voice recording
 

Regulatory Approval

FCC approval

 
 

Date approved

Aug 01, 2017
Apr 17, 2020

FCC ID value: A3LSMJ727P link
FCC ID value: ZCASMA215U link

Measured SAR

 
 

Head

0.65 W/kg
0.42 W/kg

Body

0.17 W/kg
1.27 W/kg

Simultaneous Transmission

1.59 W/kg
1.27 W/kg

Wireless Router

0.59 W/kg
1.27 W/kg

Phablet

3.99 W/kg
 

Buyers information

Price

 
$ 250
This copy is for your personal, non-commercial use only. You can order presentation-ready copies for distribution to your colleagues, clients or customers at https://www.parsintl.com/phonearena or use the Reprints & Permissions tool that appears at the bottom of each web page. Visit https://www.parsintl.com/ for samples and additional information.
FCC OKs Cingular's purchase of AT&T Wireless