Screen size
GT540 Optimus3.0"
K31Winner: 5.7"+47%
Quick verdict
K31 leads the measured specs 12-2.
Measured wins
GT540 Optimus
2
spec wins
Ties
3
equal specs
K31
12
spec wins
Overall winner
Screen size
Technology
GT540 Optimus
GSM / HSPA
K31
GSM / CDMA / HSPA / LTE
2G bands
GT540 Optimus
GSM 850 / 900 / 1800 / 1900
K31
GSM 850 / 900 / 1800 / 1900 , CDMA 800 / 1900
3G bands
GT540 Optimus
HSDPA 900 / 2100 , HSDPA 850 / 2100
K31
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
Speed
GT540 Optimus
HSPA 7.2/0.384 Mbps
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
5G support
equal specsNFC
3.5mm jack
equal specsSD card
equal specsStereo speakers
K31
HSPA, LTE
4G bands
GT540 Optimus
-
K31
2, 4, 5, 12, 13, 25, 26, 41, 66, 71
Announced
GT540 Optimus
2010, January. Released 2010, June
K31
2020, August 21. Released 2020, August 21
Status
GT540 Optimus
Discontinued
K31
Discontinued
Dimensions
GT540 Optimus
109 x 54.5 x 12.7 mm (4.29 x 2.15 x 0.5 in)
K31
147.8 x 71.1 x 8.6 mm (5.82 x 2.80 x 0.34 in)
Weight
GT540 Optimus
115.5 g (4.06 oz)
K31
146 g (5.15 oz)
SIM
GT540 Optimus
Mini-SIM
K31
Nano-SIM + Nano-SIM
Other
GT540 Optimus
-
K31
MIL-STD-810G compliant* *does not guarantee ruggedness or use in extreme conditions
Type
GT540 Optimus
TFT resistive touchscreen, 256K colors (65K effective)
K31
IPS LCD
Size
GT540 Optimus
3.0 inches, 26.8 cm2 (~45.1% screen-to-body ratio)
K31
5.7 inches, 81.1 cm2 (~77.2% screen-to-body ratio)
Resolution
GT540 Optimus
320 x 480 pixels, 3:2 ratio (~192 ppi density)
K31
720 x 1520 pixels, 19:9 ratio (~295 ppi density)
OS
GT540 Optimus
Android 1.6 (Donut), upgradable to 2.1 (Eclair)
K31
Android 10, LG UX 9.1
CPU
GT540 Optimus
600 MHz
K31
Octa-core 2.0 GHz Cortex-A53
Chipset
GT540 Optimus
-
K31
Mediatek MT6762 Helio P22 (12 nm)
GPU
GT540 Optimus
-
K31
PowerVR GE8320
Card slot
GT540 Optimus
microSDHC (dedicated slot)
K31
microSDXC
Internal
GT540 Optimus
139MB 156MB RAM
K31
32GB 2GB RAM
Other
GT540 Optimus
-
K31
eMMC 5.1
Single
GT540 Optimus
3.15 MP, AF
K31
-
Video
GT540 Optimus
480p@17fps
K31
1080p@30fps
Dual
GT540 Optimus
-
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
Features
GT540 Optimus
-
K31
LED flash, panorama, HDR
Other
GT540 Optimus
No
K31
-
Single
GT540 Optimus
-
K31
5 MP, f/2.2, 24mm (wide), 1/5.0", 1.12µm
Video
GT540 Optimus
-
K31
1080p@30fps
Loudspeaker
GT540 Optimus
Yes
K31
Yes
3.5mm jack
GT540 Optimus
Yes
K31
Yes
WLAN
GT540 Optimus
Wi-Fi 802.11 b/g
K31
Wi-Fi 802.11 b/g/n, Wi-Fi Direct
Bluetooth
GT540 Optimus
2.1, A2DP
K31
5.0, A2DP, LE
Positioning
GT540 Optimus
GPS, A-GPS
K31
GPS
Radio
GT540 Optimus
Stereo FM radio, RDS
K31
No
USB
GT540 Optimus
microUSB
K31
microUSB 2.0
NFC
GT540 Optimus
-
K31
No
Sensors
GT540 Optimus
Accelerometer
K31
Fingerprint (rear-mounted), accelerometer
Browser
GT540 Optimus
HTML
K31
-
Other
GT540 Optimus
MP4/DivX/Xvid/H.264/WMV player MP3/WAV/WMA/eAAC+ player Organizer Document viewer Voice memo Predictive text input
K31
-
Type
GT540 Optimus
Removable Li-Ion 1500 mAh battery
K31
Li-Ion 3000 mAh
Stand-by
GT540 Optimus
Up to 500 h (2G) / Up to 500 h (3G)
K31
-
Talk time
GT540 Optimus
Up to 5 h 30 min (2G) / Up to 7 h 20 min (3G)
K31
-
Colors
GT540 Optimus
Black, White, Pink
K31
Gray
Models
GT540 Optimus
T540
K31
LM-K300Q, LMK300, LGL355DL
SAR
GT540 Optimus
0.93 W/kg (head) 0.63 W/kg (body)
K31
-
Price
GT540 Optimus
About 70 EUR
K31
About 130 EUR