Screen size
K31Winner: 5.7"+39%
Optimus Z3.5"
Quick verdict
K31 leads the measured specs 12-1.
Measured wins
K31
12
spec wins
Overall winner
Ties
4
equal specs
Optimus Z
1
spec wins
Screen size
Technology
K31
GSM / CDMA / HSPA / LTE
Optimus Z
GSM / HSPA
2G bands
K31
GSM 850 / 900 / 1800 / 1900 , CDMA 800 / 1900
Optimus Z
GSM 850 / 900 / 1800 / 1900
3G bands
K31
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
Optimus Z
HSDPA 2100
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 Z
-
Speed
K31
HSPA, LTE
Optimus Z
HSPA 7.2/0.384 Mbps
Announced
K31
2020, August 21. Released 2020, August 21
Optimus Z
2010, April. Released 2010, July
Status
K31
Discontinued
Optimus Z
Discontinued
Dimensions
K31
147.8 x 71.1 x 8.6 mm (5.82 x 2.80 x 0.34 in)
Optimus Z
117.9 x 56.9 x 11 mm (4.64 x 2.24 x 0.43 in)
Weight
K31
146 g (5.15 oz)
Optimus Z
135 g (4.76 oz)
SIM
K31
Nano-SIM + Nano-SIM
Optimus Z
Mini-SIM
Other
K31
MIL-STD-810G compliant* *does not guarantee ruggedness or use in extreme conditions
Optimus Z
-
Type
K31
IPS LCD
Optimus Z
TFT, 256K colors
Size
K31
5.7 inches, 81.1 cm2 (~77.2% screen-to-body ratio)
Optimus Z
3.5 inches, 37.9 cm2 (~56.5% screen-to-body ratio)
Resolution
K31
720 x 1520 pixels, 19:9 ratio (~295 ppi density)
Optimus Z
480 x 640 pixels, 4:3 ratio (~229 ppi density)
Protection
K31
-
Optimus Z
Corning Gorilla Glass
OS
K31
Android 10, LG UX 9.1
Optimus Z
Android 2.1 (Eclair), upgradable to 2.2 (Froyo)
Chipset
K31
Mediatek MT6762 Helio P22 (12 nm)
Optimus Z
Qualcomm QSD8250 Snapdragon S1
CPU
K31
Octa-core 2.0 GHz Cortex-A53
Optimus Z
1.0 GHz Scorpion
GPU
K31
PowerVR GE8320
Optimus Z
Adreno 200
Card slot
K31
microSDXC
Optimus Z
microSDHC (dedicated slot), 4 GB included
Internal
K31
32GB 2GB RAM
Optimus Z
-
Other
K31
eMMC 5.1
Optimus Z
-
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 Z
-
Features
K31
LED flash, panorama, HDR
Optimus Z
-
Video
K31
1080p@30fps
Optimus Z
720p
Single
K31
-
Optimus Z
5 MP, AF
Single
K31
5 MP, f/2.2, 24mm (wide), 1/5.0", 1.12µm
Optimus Z
-
Video
K31
1080p@30fps
Optimus Z
-
Other
K31
-
Optimus Z
No
Loudspeaker
K31
Yes
Optimus Z
Yes
3.5mm jack
K31
Yes
Optimus Z
Yes
WLAN
K31
Wi-Fi 802.11 b/g/n, Wi-Fi Direct
Optimus Z
Wi-Fi 802.11 b/g, DLNA, hotspot (Android 2.2)
Bluetooth
K31
5.0, A2DP, LE
Optimus Z
2.1, A2DP
Positioning
K31
GPS
Optimus Z
GPS, A-GPS
NFC
K31
No
Optimus Z
-
Radio
K31
No
Optimus Z
No
USB
K31
microUSB 2.0
Optimus Z
microUSB 2.0
Sensors
K31
Fingerprint (rear-mounted), accelerometer
Optimus Z
Accelerometer, proximity, compass
Browser
K31
-
Optimus Z
WAP 2.0/xHTML, HTML, Adobe Flash
Other
K31
-
Optimus Z
On-screen-phone function Drag & Shake file sharing TV Tuner (T-DMB) HDMI port MP3/WMA/AAC player DivX/MP4/H.263 player Organizer Document viewer Voice memo Predictive text input
Type
K31
Li-Ion 3000 mAh
Optimus Z
Removable Li-Ion 1350 mAh battery
Stand-by
K31
-
Optimus Z
Up to 200 h
Talk time
K31
-
Optimus Z
Up to 4 h 10 min
Colors
K31
Gray
Optimus Z
Black, White, Pink
Models
K31
LM-K300Q, LMK300, LGL355DL
Optimus Z
-
Price
K31
About 130 EUR
Optimus Z
-