Screen size
equal specsK315.7"
K405.7"
Quick verdict
K40 leads the measured specs 5-2.
Measured wins
K31
2
spec wins
Ties
10
equal specs
K40
5
spec wins
Overall winner
Screen size
equal specsTechnology
K31
GSM / CDMA / HSPA / LTE
K40
GSM / HSPA / LTE
2G bands
K31
GSM 850 / 900 / 1800 / 1900 , CDMA 800 / 1900
K40
GSM 850 / 900 / 1800 / 1900
3G bands
K31
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
K40
HSDPA 850 / 900 / 1900 / 2100
4G bands
K31
2, 4, 5, 12, 13, 25, 26, 41, 66, 71
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
equal specsRAM
equal specsStorage
equal specsMain camera
Front camera
Battery
equal specsWired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
equal specsUSB
equal specs5G support
equal specsNFC
3.5mm jack
equal specsSD card
equal specsStereo speakers
K40
1, 3, 7, 8, 20
Speed
K31
HSPA, LTE
K40
HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps
Announced
K31
2020, August 21. Released 2020, August 21
K40
2019, February. Released 2019, April
Status
K31
Discontinued
K40
Discontinued
Dimensions
K31
147.8 x 71.1 x 8.6 mm (5.82 x 2.80 x 0.34 in)
K40
153 x 71.9 x 8.3 mm (6.02 x 2.83 x 0.33 in)
Weight
K31
146 g (5.15 oz)
K40
144 g (5.08 oz)
SIM
K31
Nano-SIM + Nano-SIM
K40
· Nano-SIM· Nano-SIM + Nano-SIM
Other
K31
MIL-STD-810G compliant* *does not guarantee ruggedness or use in extreme conditions
K40
MIL-STD-810G compliant* *does not guarantee ruggedness or use in extreme conditions
Build
K31
-
K40
Glass front, plastic back, plastic frame
Type
K31
IPS LCD
K40
IPS LCD
Size
K31
5.7 inches, 81.1 cm2 (~77.2% screen-to-body ratio)
K40
5.7 inches, 83.8 cm2 (~76.2% screen-to-body ratio)
Resolution
K31
720 x 1520 pixels, 19:9 ratio (~295 ppi density)
K40
720 x 1440 pixels, 18:9 ratio (~282 ppi density)
OS
K31
Android 10, LG UX 9.1
K40
Android 8.1 (Oreo), LG UX 7
Chipset
K31
Mediatek MT6762 Helio P22 (12 nm)
K40
Mediatek MT6762 Helio P22 (12 nm)
CPU
K31
Octa-core 2.0 GHz Cortex-A53
K40
Octa-core 2.0 GHz Cortex-A53
GPU
K31
PowerVR GE8320
K40
PowerVR GE8320
Card slot
K31
microSDXC
K40
microSDXC (dedicated slot)
Internal
K31
32GB 2GB RAM
K40
32GB 2GB RAM, 32GB 3GB RAM
Other
K31
eMMC 5.1
K40
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
K40
-
Features
K31
LED flash, panorama, HDR
K40
LED flash, panorama, HDR
Video
K31
1080p@30fps
K40
1080p@30fps
Single
K31
-
K40
16 MP, f/2.0, 1/3.1", 1.0µm, PDAF
Single
K31
5 MP, f/2.2, 24mm (wide), 1/5.0", 1.12µm
K40
8 MP, f/2.0
Video
K31
1080p@30fps
K40
1080p@30fps
Features
K31
-
K40
LED flash
Loudspeaker
K31
Yes
K40
Yes
3.5mm jack
K31
Yes
K40
Yes
WLAN
K31
Wi-Fi 802.11 b/g/n, Wi-Fi Direct
K40
Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA
Bluetooth
K31
5.0, A2DP, LE
K40
5.0, A2DP, LE
Positioning
K31
GPS
K40
GPS, GLONASS
NFC
K31
No
K40
Yes (market/region dependent)
Radio
K31
No
K40
No
USB
K31
microUSB 2.0
K40
microUSB 2.0, OTG
Sensors
K31
Fingerprint (rear-mounted), accelerometer
K40
Fingerprint (rear-mounted), accelerometer, proximity, compass
Type
K31
Li-Ion 3000 mAh
K40
Li-Ion 3000 mAh, non-removable
Colors
K31
Gray
K40
Black, New Moroccan Blue, New Platinum Gray
Models
K31
LM-K300Q, LMK300, LGL355DL
K40
LMX420, LMX420EMW, LM-X420
Price
K31
About 130 EUR
K40
About 140 EUR