Screen size
K31Winner: 5.7"+21%
Optimus LTE SU6404.5"
Quick verdict
K31 leads the measured specs 11-2.
Measured wins
K31
11
spec wins
Overall winner
Ties
4
equal specs
Optimus LTE SU640
2
spec wins
Screen size
Technology
K31
GSM / CDMA / HSPA / LTE
Optimus LTE SU640
GSM / HSPA / LTE
2G bands
K31
GSM 850 / 900 / 1800 / 1900 , CDMA 800 / 1900
Optimus LTE SU640
GSM 850 / 900 / 1800 / 1900
3G bands
K31
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
Optimus LTE SU640
HSDPA 850 / 1900
4G bands
K31
2, 4, 5, 12, 13, 25, 26, 41, 66, 71
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
Storage
Main camera
Front camera
Battery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
USB
equal specs5G support
equal specsNFC
3.5mm jack
equal specsSD card
equal specsStereo speakers
Optimus LTE SU640
LTE 800
Speed
K31
HSPA, LTE
Optimus LTE SU640
HSPA, LTE
Announced
K31
2020, August 21. Released 2020, August 21
Optimus LTE SU640
2011, October. Released 2012, August
Status
K31
Discontinued
Optimus LTE SU640
Discontinued
Dimensions
K31
147.8 x 71.1 x 8.6 mm (5.82 x 2.80 x 0.34 in)
Optimus LTE SU640
132.9 x 67.9 x 10.4 mm (5.23 x 2.67 x 0.41 in)
Weight
K31
146 g (5.15 oz)
Optimus LTE SU640
135 g (4.76 oz)
SIM
K31
Nano-SIM + Nano-SIM
Optimus LTE SU640
Mini-SIM
Other
K31
MIL-STD-810G compliant* *does not guarantee ruggedness or use in extreme conditions
Optimus LTE SU640
-
Type
K31
IPS LCD
Optimus LTE SU640
HD-IPS LCD
Size
K31
5.7 inches, 81.1 cm2 (~77.2% screen-to-body ratio)
Optimus LTE SU640
4.5 inches, 55.8 cm2 (~61.9% screen-to-body ratio)
Resolution
K31
720 x 1520 pixels, 19:9 ratio (~295 ppi density)
Optimus LTE SU640
720 x 1280 pixels, 16:9 ratio (~326 ppi density)
Other
K31
-
Optimus LTE SU640
True HD Graphic Engine
OS
K31
Android 10, LG UX 9.1
Optimus LTE SU640
Android 2.3.5 (Gingerbread), upgradable to 4.0 (Ice Cream Sandwich)
Chipset
K31
Mediatek MT6762 Helio P22 (12 nm)
Optimus LTE SU640
Qualcomm MSM8660 Snapdragon S3
CPU
K31
Octa-core 2.0 GHz Cortex-A53
Optimus LTE SU640
Dual-core 1.5 GHz Scorpion
GPU
K31
PowerVR GE8320
Optimus LTE SU640
Adreno 220
Card slot
K31
microSDXC
Optimus LTE SU640
microSDHC (dedicated slot), 16 GB included
Internal
K31
32GB 2GB RAM
Optimus LTE SU640
4GB 1GB RAM
Other
K31
eMMC 5.1
Optimus LTE SU640
-
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
Optimus LTE SU640
-
Features
K31
LED flash, panorama, HDR
Optimus LTE SU640
LED flash
Video
K31
1080p@30fps
Optimus LTE SU640
1080p@30fps
Single
K31
-
Optimus LTE SU640
8 MP, AF
Single
K31
5 MP, f/2.2, 24mm (wide), 1/5.0", 1.12µm
Optimus LTE SU640
1.3 MP
Video
K31
1080p@30fps
Optimus LTE SU640
Loudspeaker
K31
Yes
Optimus LTE SU640
Yes
3.5mm jack
K31
Yes
Optimus LTE SU640
Yes
WLAN
K31
Wi-Fi 802.11 b/g/n, Wi-Fi Direct
Optimus LTE SU640
Wi-Fi 802.11 a/b/g/n, dual-band, Wi-Fi Direct, DLNA, hotspot
Bluetooth
K31
5.0, A2DP, LE
Optimus LTE SU640
3.0, A2DP
Positioning
K31
GPS
Optimus LTE SU640
GPS, A-GPS
NFC
K31
No
Optimus LTE SU640
-
Radio
K31
No
Optimus LTE SU640
No
USB
K31
microUSB 2.0
Optimus LTE SU640
microUSB 2.0 (MHL TV-out)
Sensors
K31
Fingerprint (rear-mounted), accelerometer
Optimus LTE SU640
Accelerometer, gyro, proximity, compass
Other
K31
-
Optimus LTE SU640
T-DMB TV tuner MP4/H.264/WMV/DviX player MP3/WMA/WAV/FLAC/eAAC+ player True HD movie editor Document viewer/editor Organizer Voice memo/dial/commands Predictive text input
Type
K31
Li-Ion 3000 mAh
Optimus LTE SU640
Removable Li-Ion 1830 mAh battery
Stand-by
K31
-
Optimus LTE SU640
Up to 400 h
Talk time
K31
-
Optimus LTE SU640
Up to 7 h
Colors
K31
Gray
Optimus LTE SU640
Black, White
Models
K31
LM-K300Q, LMK300, LGL355DL
Optimus LTE SU640
-
Price
K31
About 130 EUR
Optimus LTE SU640
About 120 EUR