Samsung Galaxy J7 vs LG K51 vs LG K31

Compare phone and tablet specifications of up to three devices at once.

Display

Size:

5.5 inches
6.5 inches
5.7 inches

Resolution:

1280 x 720 pixels, 267 PPI
1560 x 720 pixels, 19.5:9 ratio, 264 PPI
1520 x 720 pixels, 19:9 ratio, 295 PPI

Technology:

Super AMOLED
IPS LCD
IPS LCD

Screen-to-body:

69.72 %
79.70 %
77.13 %

Colors:

16 777 216

Touchscreen:

Capacitive, Multi-touch

Features:

Ambient light sensor, Proximity sensor
Ambient light sensor, Proximity sensor
Ambient light sensor, Proximity sensor

Hardware

System chip:

Qualcomm Snapdragon 615 8939
MediaTek Helio P22 MT6762
MediaTek Helio P22 MT6762

Processor:

Octa-core, 1500 MHz, ARM Cortex-A53, 64-bit
Octa-core, 2000 MHz, Arm Cortex-A53, 64-bit, 12 nm
Octa-core, 2000 MHz, Arm Cortex-A53, 64-bit, 12 nm

GPU:

Adreno 405
IMG PowerVR GE8320
IMG PowerVR GE8320

RAM:

1.5GB LPDDR3
3GB
2GB

Internal storage:

16GB, available to use: 11.6 GB
32GB, available to use: 18 GB
32GB, available to use: 17 GB

Storage expansion:

microSDXC up to 128 GB
microSDXC up to 2000 GB
microSDXC up to 32 GB

Device type:

Smartphone
Smartphone
Smartphone

OS:

Android (6.0 Marshmallow, 5.1 Lollipop)
Android (10)
Android (10)

Battery

Capacity:

3000 mAh
4000 mAh
3000 mAh

Type:

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

Camera

Rear:

Single camera
Triple camera
Dual camera

Main camera:

13 MP (Autofocus)
13 MP (PDAF)
13 MP (PDAF)

Specifications:

Aperture size: F1.9; Focal length: 28 mm
Aperture size: F1.8; Sensor size: 1/3"; Pixel size: 1.12 μm
Aperture size: F1.8; Sensor size: 1/3"; Pixel size: 1.12 μm

Second camera:

5 MP (Ultra-wide)
5 MP (Ultra-wide)

Specifications:

Aperture size: F2.2; Sensor size: 1/5"; Pixel size: 1.12 μm
Aperture size: F2.2; Sensor size: 1/5"; Pixel size: 1.12 μm

Third camera:

2 MP (Depth information)

Specifications:

Sensor size: 1/5"; Pixel size: 1.75 μm

Video recording:

1920x1080 (Full HD) (30 fps)
1920x1080 (Full HD)
1920x1080 (Full HD) (30 fps)

Features:

Video calling
Picture-taking during video recording

Front:

5 MP (Flash)
13 MP
5 MP

Video capture:

1920x1080 (Full HD)
1920x1080 (Full HD)

Design

Dimensions:

6.00 x 3.09 x 0.30 inches (152.4 x 78.6 x 7.5 mm)
6.57 x 3.07 x 0.33 inches (166.9 x 77.9 x 8.4 mm)
5.82 x 2.8 x 0.34 inches (147.8 x 71.1 x 8.6 mm)

Weight:

6.03 oz (171.0 g)
7.17 oz (203.4 g)
5.15 oz (146.0 g)

Materials:

Back: Plastic; Frame: Plastic

Resistance:

Yes; MIL-STD-810 certified
Yes; MIL-STD-810 certified

Biometrics:

Fingerprint (touch)
Fingerprint (touch)

Features:

Touch sensitive control keys

Keys:

Left: Volume control; Right: Lock/Unlock key
Left: Volume control; Right: Lock/Unlock key
Left: Volume control; Right: Lock/Unlock key

Colors:

Black, Gold, White
Titan gray
Silver

Cellular

LTE (FDD):

Bands 1(2100), 3(1800), 5(850), 7(2600), 8(900), 20(800 DD)
Bands 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 12(700 a), 13(700 c), 20(800 DD), 25(1900+), 26(850+), 66(AWS-3), 71(600)
Bands 2(1900), 4(AWS-1), 5(850), 12(700 a), 13(700 c), 25(1900+), 26(850+), 66(AWS-3), 71(600)

LTE (TDD):

Bands 40(2300)
Bands 41(2600+)
Bands 41(2600+)

UMTS:

Bands 5(850), 8(900), 2(1900), 1(2100)
Bands 1(2100), 2(1900), 4(1700/2100), 5(850), 8(900)
Bands 1(2100), 2(1900), 4(1700/2100), 5(850), 8(900)

Data Speed:

LTE, HSPA
LTE-A Cat 6 (300/50 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
LTE-A Cat 7 (300/100 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s

Dual SIM:

Yes

SIM type:

Micro SIM
Nano SIM
Nano SIM

HD Voice:

Yes
Yes

VoLTE:

Yes

Multimedia

Headphones:

3.5mm jack
3.5mm jack
3.5mm jack

Speakers:

Earpiece, Loudspeaker
Earpiece, Multiple speakers
Earpiece, Loudspeaker

Features:

Album art cover, Background playback
DTS:X Virtual Surround

Screen mirroring:

Wireless screen share
Wireless screen share
Wireless screen share

Radio:

FM, RDS
FM
FM

Additional microphone(s):

for Noise cancellation
for Noise cancellation

Connectivity & Features

Bluetooth:

4.1
5.0
5.0

Wi-Fi:

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

USB:

microUSB, USB 2.0
Type-C (reversible), USB 2.0
microUSB, USB 2.0

Features:

Mass storage device, Charging
Charging
Charging

Location:

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

Sensors:

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

Other:

ANT+
UMA (Wi-Fi Calling)

Hearing aid compatible:

M3, T3
M3, T3

Phone features

Notifications:

Haptic feedback, Music ringtones (MP3), Polyphonic ringtones, Vibration, Flight mode, Silent mode, Speakerphone

Other features:

Voice dialing, Voice commands, Voice recording

Regulatory Approval

FCC approval:

Date approved:

Jun 16, 2020
Sep 14, 2020

FCC ID value:

ZNFL555DL
ZNFK300AM

Measured SAR:

Head:

0.66 W/kg
0.47 W/kg

Body:

1.20 W/kg
0.91 W/kg

Simultaneous Transmission:

1.59 W/kg
1.26 W/kg

Wireless Router:

1.27 W/kg
1.02 W/kg

Phablet:

3.96 W/kg

Buyers information

Price:

$ 234
$ 200
$ 150

User Manual:

This is the official LG K51 User Guide in English provided from the manufacturer.
This is the official LG K31 User Guide in English provided from the manufacturer.

In The Box:

Charger, USB Cable, SIM Ejector
Travel Adapter, USB Cable

Availability

Officially announced:

Jul 16, 2015
May 06, 2020
FCC OKs Cingular\'s purchase of AT&T Wireless