Samsung Galaxy A40 vs LG K31 Specs Comparison

Compare mobile phone specifications of up to three devices at once. Our specs comparison tool helps you find and compare the perfect phone for your needs.

Samsung Galaxy A40 LG K31
Released · Apr 10, 2019
Released · Aug 21, 2020
5.9-inch
5.7-inch
Dual camera
Dual camera
4GB · 64GB
2GB · 32GB
3100 mAh
3000 mAh

Design

Dimensions
5.69 x 2.72 x 0.31 inches
144.4 x 69.2 x 7.9 mm
5.82 x 2.8 x 0.34 inches
147.8 x 71.1 x 8.6 mm
Weight
4.94 oz (140.0 g) 5.15 oz (146.0 g)
Materials
Back: Plastic
Frame: Plastic
Back: Plastic
Frame: Plastic
Resistance
Yes; MIL-STD-810 certified
Biometrics
2D Face unlock, Fingerprint (touch) Fingerprint (touch)
Keys
Right: Volume control, Lock/Unlock key Left: Volume control; Right: Lock/Unlock key
Colors
Black, Coral, Blue, White Silver

Display

Size
5.9-inch 5.7-inch
Resolution
2340x1080px, 19.5:9 ratio, 437 PPI 1520x720px, 19:9 ratio, 295 PPI
Technology
Super AMOLED IPS LCD
Screen-to-body
85.73 % 77.13 %
Features
Scratch-resistant glass (Corning Gorilla Glass 3), Ambient light sensor, Proximity sensor Ambient light sensor, Proximity sensor

Hardware

System chip
Exynos 7904 (14 nm) MediaTek Helio P22 MT6762 (12 nm)
Processor
Octa-core
1800 MHz
ARM Cortex-A73 and ARM Cortex-A53
Octa-core
2000 MHz
Arm Cortex-A53
GPU
Mali-G71 MP2 IMG PowerVR GE8320
RAM
4GB (LPDDR4) 2GB
Internal storage
64GB, available to use: 49.4 GB 32GB, available to use: 17 GB
Storage expansion
microSDXC up to 512 GB microSDXC up to 32 GB
OS
Android (11, 10, 9.0 Pie), Samsung One UI Android (10)

Battery

Capacity
3100 mAh 3000 mAh
Type
Li - Polymer
Charging
Samsung Adaptive Fast Charging

Camera

Rear
Dual camera Dual camera
Main camera
16 MP (PDAF)
Aperture size: F1.7
Focal length: 27 mm
Sensor size: 1/2.8"
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
Focal Length: 13 mm
Sensor size: 1/5"
Pixel size: 1.12 μm
5 MP (Ultra-wide)
Aperture size: F2.2
Sensor size: 1/5"
Pixel size: 1.12 μm
Flash
LED LED
Video recording
1920x1080 (Full HD) (30 fps)
Hyperlapse, Video calling, Video sharing
1920x1080 (Full HD) (30 fps)
Front
25 MP, Video capture: 1920x1080 (Full HD) 5 MP, Video capture: 1920x1080 (Full HD)

Connectivity & Features

Bluetooth
5.0 5.0
WLAN
802.11 a,b,g,n,ac,dual-band
Wi-Fi Direct, Hotspot
802.11 b,g,n
Wi-Fi Direct, Hotspot
USB
Type-C, USB 2.0 microUSB, USB 2.0
Hearing aid compatible
M3/T3
Location
GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning GPS, A-GPS, Cell ID, Wi-Fi positioning
Sensors
Accelerometer, Gyroscope, Compass, Hall (for flip covers) Accelerometer
Other
NFC, ANT+, VoIP, Tethering, Computer sync, OTA sync UMA (Wi-Fi Calling)

Multimedia

Headphones
3.5mm jack 3.5mm jack
Speakers
Earpiece, Loudspeaker Earpiece, Loudspeaker
Features
Dolby Atmos, Album art cover, Background playback
Screen mirroring
Wireless screen share Wireless screen share
Radio
FM FM
Additional microphone(s)
Noise cancellation Noise cancellation

Cellular

4G (FDD)
Bands 1(2100), 3(1800), 5(850), 7(2600), 8(900), 20(800 DD) Bands 2(1900), 4(AWS-1), 5(850), 12(700 a), 13(700 c), 25(1900+), 26(850+), 66(AWS-3), 71(600)
4G (TDD)
Bands 38(2600), 40(2300), 41(2600+) Bands 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 12/13 (600/150 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
Nano SIM Nano SIM
HD Voice
Yes

Regulatory Approval

FCC approval
Date approved: Mar 08, 2019
FCC ID value: A3LSMA405FN
Date approved: Sep 14, 2020
FCC ID value: ZNFK300AM
Measured SAR
Head: 0.51 W/kg
Body: 0.46 W/kg
Simultaneous Transmission: 1.02 W/kg
Wireless Router: 0.61 W/kg
Head: 0.47 W/kg
Body: 0.91 W/kg
Simultaneous Transmission: 1.26 W/kg
Wireless Router: 1.02 W/kg

Buyers information

MSRP
$ 150
In The Box
Travel Adapter, USB Cable

Availability

Officially announced
Apr 10, 2019
FCC OKs Cingular\'s purchase of AT&T Wireless