LG K40 vs LG K31 vs LG K8x

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

Display

Size:

5.7 inches
5.7 inches
5.7 inches

Resolution:

1440 x 720 pixels, 18:9 ratio, 282 PPI
1520 x 720 pixels, 19:9 ratio, 295 PPI
1520 x 720 pixels, 19:9 ratio, 295 PPI

Technology:

IPS LCD
IPS LCD
IPS LCD

Screen-to-body:

76.28 %
77.13 %
77.13 %

Features:

Scratch-resistant glass (Tempered Glass), Ambient light sensor, Proximity sensor
Ambient light sensor, Proximity sensor
Ambient light sensor, Proximity sensor

Hardware

System chip:

Qualcomm Snapdragon 450 SDM450
MediaTek Helio P22 MT6762
MediaTek Helio P22 MT6762

Processor:

Octa-core, 2000 MHz, ARM Cortex-A53, 64-bit, 14 nm
Octa-core, 2000 MHz, Arm Cortex-A53, 64-bit, 12 nm
Octa-core, 2000 MHz, Arm Cortex-A53, 64-bit, 12 nm

GPU:

Adreno 506
IMG PowerVR GE8320
IMG PowerVR GE8320

RAM:

2GB LPDDR3
2GB
2GB

Internal storage:

16GB, available to use: 8 GB
32GB, available to use: 17 GB
32GB

Storage expansion:

microSDXC up to 2000 GB
microSDXC up to 32 GB
microSDXC

Device type:

Smartphone
Smartphone
Smartphone

OS:

Android (8.1 Oreo)
Android (10)
Android (10)

Battery

Capacity:

3000 mAh
3000 mAh
3000 mAh

Type:

Li - Polymer, Not user replaceable
Not user replaceable
Not user replaceable

Camera

Rear:

Single camera
Dual camera
Dual camera

Main camera:

8 MP (PDAF)
13 MP (PDAF)
13 MP (PDAF)

Specifications:

Aperture size: F2.0; Sensor size: 1/3"; Pixel size: 1 μm
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

Video recording:

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

Features:

Video calling, Video sharing

Front:

5 MP (Flash)
5 MP
5 MP

Video capture:

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

Design

Dimensions:

6.02 x 2.83 x 0.33 inches (153.0 x 71.9 x 8.3 mm)
5.82 x 2.8 x 0.34 inches (147.8 x 71.1 x 8.6 mm)
5.82 x 2.8 x 0.34 inches (147.8 x 71.1 x 8.6 mm)

Weight:

5.11 oz (145.0 g)
5.15 oz (146.0 g)
5.15 oz (146.0 g)

Materials:

Back: Plastic
Back: Plastic; Frame: Plastic
Back: Plastic; Frame: Plastic

Resistance:

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

Biometrics:

Fingerprint (touch)
Fingerprint (touch)
Fingerprint (touch)

Keys:

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

Colors:

Black, Gray, Blue
Silver
Silver

Cellular

LTE (FDD):

Bands 2(1900), 4(AWS-1), 5(850), 12(700 a), 13(700 c), 66(AWS-3)
Bands 2(1900), 4(AWS-1), 5(850), 12(700 a), 13(700 c), 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+), 66(AWS-3)

LTE (TDD):

Bands 41(2600+)
Bands 41(2600+)

UMTS:

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

Data Speed:

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
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
Nano SIM

HD Voice:

Yes
Yes
Yes

Multimedia

Headphones:

3.5mm jack
3.5mm jack
3.5mm jack

Speakers:

Earpiece, Loudspeaker
Earpiece, Loudspeaker
Earpiece, Loudspeaker

Features:

Album art cover, Background playback

Screen mirroring:

Wireless screen share
Wireless screen share
Wireless screen share

Radio:

FM
FM
FM

Additional microphone(s):

for Noise cancellation
for Noise cancellation

Connectivity & Features

Bluetooth:

5.0
5.0
5.0

Wi-Fi:

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

USB:

microUSB, USB 2.0
microUSB, USB 2.0
microUSB, USB 2.0

Features:

Charging, OTG, Mass storage device
Charging
Charging

Location:

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

Sensors:

Accelerometer, Compass
Accelerometer
Accelerometer

Other:

NFC, VoIP, Tethering, Computer sync, OTA sync
UMA (Wi-Fi Calling)

Hearing aid compatible:

M3, T3
M3, T3
M3, T3

Regulatory Approval

FCC approval:

Date approved:

Apr 01, 2020

FCC ID value:

ZNFK300UM link

Measured SAR:

Head:

0.52 W/kg

Body:

0.91 W/kg

Simultaneous Transmission:

1.24 W/kg

Wireless Router:

0.94 W/kg

Buyers information

Price:

$ 180
$ 150
$ 40

User Manual:

This is the official LG K31 User Guide in English provided from the manufacturer.
This is the official LG K8x User Guide in English provided from the manufacturer.

In The Box:

Travel Adapter, USB Cable
Handset, Travel Adapter, USB Data Cable, SIM card, Quick Reference Guide

Availability

Officially announced:

Feb 20, 2019
FCC OKs Cingular\'s purchase of AT&T Wireless