Screen size
K315.7"
K40SWinner: 6.1"+6.6%
Quick verdict
K40S leads the measured specs 4-2.
Measured wins
K31
2
spec wins
Ties
11
equal specs
K40S
4
spec wins
Overall winner
Screen size
Technology
K31
GSM / CDMA / HSPA / LTE
K40S
GSM / HSPA / LTE
2G bands
K31
GSM 850 / 900 / 1800 / 1900 , CDMA 800 / 1900
K40S
GSM 850 / 900 / 1800 / 1900
3G bands
K31
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
K40S
HSDPA 850 / 900 / 1900 / 2100
4G bands
K31
2, 4, 5, 12, 13, 25, 26, 41, 66, 71
Resolution
equal specsRefresh rate
Peak brightness
Pixel density
CPU speed
equal specsRAM
equal specsStorage
equal specsMain camera
equal specsFront camera
Battery
Wired charging
Weight
Thickness
equal specsIP rating
Wi‑Fi
Bluetooth
equal specsUSB
equal specs5G support
equal specsNFC
3.5mm jack
equal specsSD card
equal specsStereo speakers
K40S
1, 3, 7, 8, 20
Speed
K31
HSPA, LTE
K40S
HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps
Announced
K31
2020, August 21. Released 2020, August 21
K40S
2019, August. Released 2019, September
Status
K31
Discontinued
K40S
Discontinued
Dimensions
K31
147.8 x 71.1 x 8.6 mm (5.82 x 2.80 x 0.34 in)
K40S
156.3 x 73.9 x 8.6 mm (6.15 x 2.91 x 0.34 in)
Weight
K31
146 g (5.15 oz)
K40S
186 g (6.56 oz)
SIM
K31
Nano-SIM + Nano-SIM
K40S
· Nano-SIM· Nano-SIM + Nano-SIM
Other
K31
MIL-STD-810G compliant* *does not guarantee ruggedness or use in extreme conditions
K40S
MIL-STD-810G compliant* *does not guarantee ruggedness or use in extreme conditions
Type
K31
IPS LCD
K40S
IPS LCD
Size
K31
5.7 inches, 81.1 cm2 (~77.2% screen-to-body ratio)
K40S
6.1 inches, 92.9 cm2 (~80.4% screen-to-body ratio)
Resolution
K31
720 x 1520 pixels, 19:9 ratio (~295 ppi density)
K40S
720 x 1520 pixels, 19:9 ratio (~276 ppi density)
OS
K31
Android 10, LG UX 9.1
K40S
Android 9.0 (Pie), upgradable to Android 10
Chipset
K31
Mediatek MT6762 Helio P22 (12 nm)
K40S
Mediatek MT6762 Helio P22 (12 nm)
CPU
K31
Octa-core 2.0 GHz Cortex-A53
K40S
Octa-core 2.0 GHz Cortex-A53
GPU
K31
PowerVR GE8320
K40S
PowerVR GE8320
Card slot
K31
microSDXC
K40S
microSDXC (dedicated slot)
Internal
K31
32GB 2GB RAM
K40S
32GB 2GB RAM, 32GB 3GB RAM
Other
K31
eMMC 5.1
K40S
eMMC 5.1
Dual
K31
13 MP, f/1.8, 27mm (wide), 1/3.1", 1.12µm, PDAF 5 MP, f/2.2, 120˚ (ultrawide), 1/5.0", 1.12µm
K40S
13 MP, f/2.2, 26mm (wide), PDAF 5 MP, (ultrawide)
Features
K31
LED flash, panorama, HDR
K40S
LED flash, panorama, HDR
Video
K31
1080p@30fps
K40S
1080p@30fps
Single
K31
5 MP, f/2.2, 24mm (wide), 1/5.0", 1.12µm
K40S
13 MP, f/2.0, 1/3.1", 1.12µm
Video
K31
1080p@30fps
K40S
1080p@30fps
Loudspeaker
K31
Yes
K40S
Yes
3.5mm jack
K31
Yes
K40S
Yes
WLAN
K31
Wi-Fi 802.11 b/g/n, Wi-Fi Direct
K40S
Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA
Bluetooth
K31
5.0, A2DP, LE
K40S
5.0, A2DP, LE
Positioning
K31
GPS
K40S
GPS, GLONASS
NFC
K31
No
K40S
Yes (market/region dependent)
Radio
K31
No
K40S
No
USB
K31
microUSB 2.0
K40S
microUSB 2.0, OTG
Sensors
K31
Fingerprint (rear-mounted), accelerometer
K40S
Fingerprint (rear-mounted), accelerometer, proximity
Type
K31
Li-Ion 3000 mAh
K40S
Li-Po 3500 mAh, non-removable
Colors
K31
Gray
K40S
New Aurora Black, New Moroccan Blue
Models
K31
LM-K300Q, LMK300, LGL355DL
K40S
LMX430HM, LM-X430
Price
K31
About 130 EUR
K40S
About 160 EUR