Samsung Galaxy J3 (2018) vs LG K31 Specs Comparison

Availability

Officially announced
Jun 07, 2018
Prices (MSRP)
	$150

Design

Dimensions
5.62 x 2.76 x 0.35 inches 142.7 x 70.1 x 8.9 mm	5.82 x 2.8 x 0.34 inches 147.8 x 71.1 x 8.6 mm
Weight
5.36 oz (152.0 g)	5.15 oz (146.0 g)
Materials
Back: Plastic	Back: Plastic Frame: Plastic
Resistance
	Yes; MIL-STD-810 certified
Biometrics
	Fingerprint (touch)
Features
Touch sensitive control keys
Keys
Left: Volume control; Right: Lock/Unlock key	Left: Volume control; Right: Lock/Unlock key
Colors
Silver	Silver

Display

Size
5.0-inch, 68.87% screen-to-body	5.7-inch, 77.13% screen-to-body
Type
TFT	IPS LCD
Resolution
1280x720px, 16:9 ratio, 294 PPI	1520x720px, 19:9 ratio, 295 PPI
Colors
16 777 216

Hardware

System chip
Samsung Exynos 7 Quad 7570 (14 nm)	MediaTek Helio P22 MT6762 (12 nm)
Processor
Quad-core 1400 MHz ARM Cortex-A53	Octa-core 2000 MHz Arm Cortex-A53
GPU
Mali-T720 MP1	IMG PowerVR GE8320
Memory
2GB/16GB	2GB/32GB
Storage expansion
microSDXC up to 400 GB	microSDXC up to 32 GB
OS
Android (9.0 Pie, 8.0 Oreo)	Android (10)

Battery

Type
2600 mAh	3000 mAh

Camera

Rear
Single camera	Dual camera
Main camera
8 MP (Autofocus, BSI sensor) Aperture size: F1.9 Focal length: 27 mm Sensor size: 1/4" Pixel size: 1.12 μm	13 MP (PDAF) Aperture size: F1.8 Sensor size: 1/3" Pixel size: 1.12 μm
Second camera
	5 MP (Ultra-wide) Aperture size: F2.2 Sensor size: 1/5" Pixel size: 1.12 μm
Flash
LED	LED
Video recording
1080p (30 fps) Video calling, Video sharing	1080p (30 fps)
Front
5 MP Video capture: 1080p	5 MP Video capture: 1080p

Connectivity & Features

Bluetooth
4.2	5.0
WLAN
b,g,n Hotspot, Wi-Fi Direct 802.11 b, g, n	b,g,n Wi-Fi Direct, Hotspot 802.11 b, g, n
USB
microUSB, USB 2.0	microUSB, USB 2.0
Sensors
Accelerometer, Gyroscope, Compass, Proximity sensor	Accelerometer, Ambient light sensor, Proximity sensor
Hearing aid compatible
M3/T3	M3/T3
Location
GPS, A-GPS, Glonass	GPS, A-GPS, Cell ID, Wi-Fi positioning
Other
UMA (Wi-Fi Calling), VoIP, Tethering, Computer sync, OTA sync	UMA (Wi-Fi Calling)

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
Additional microphone(s)
	Noise cancellation

Cellular

4G (FDD) Bands
2, 3, 4, 5, 7, 12, 14	2, 4, 5, 12, 13, 25, 26, 66, 71
4G (TDD) Bands
	41
3G Bands
5, 2, 1	1, 2, 4, 5, 8
Data Speed
LTE Cat 4 (150/50 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s, HSUPA, UMTS	LTE-A Cat 7 (300/100 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
SIM type
Nano SIM	Nano SIM
HD Voice
Yes	Yes

Phone Features

Notifications
Haptic feedback, Music ringtones, Vibration, Flight mode, Silent mode, Speakerphone
Other features
Voice dialing, Voice commands, Voice recording, TTY/TDD

Regulatory Approval

FCC approval
Date approved: Apr 04, 2018 FCC ID value: A3LSMJ337A	Date approved: Sep 14, 2020 FCC ID value: ZNFK300AM
Measured SAR
Head: 1.22 W/kg Body: 1.02 W/kg Simultaneous Transmission: 1.56 W/kg Wireless Router: 1.18 W/kg	Head: 0.47 W/kg Body: 0.91 W/kg Simultaneous Transmission: 1.26 W/kg Wireless Router: 1.02 W/kg

Alternative variants

for AT&T Prepaid

Colors	Black

for Verizon

System chip	Samsung Exynos 7884A
Processor	Octa-core 1350 MHz ARM-Cortex A73 and ARM-Cortex A53
4G (FDD) Bands	2, 3, 4, 5, 7, 13
FCC approval	Date approved: May 07, 2018 FCC ID value: A3LSMJ337V
Measured SAR	Head: 1.14 W/kg Body: 0.92 W/kg Simultaneous Transmission: 1.59 W/kg Wireless Router: 1.17 W/kg

for Sprint and Boost Mobile

System chip	Samsung Exynos 7884A
Processor	Octa-core 1350 MHz ARM-Cortex A73 and ARM-Cortex A53
4G (FDD) Bands	25, 26
4G (TDD) Bands	41

for T-Mobile

4G (FDD) Bands	2, 4, 5, 12, 66, 71

Links

Full specifications
Samsung Galaxy J3 (2018) Specs	LG K31 Specs