Screen size
K31Winner: 5.7"+30%
Optimus F34.0"
Quick verdict
K31 leads the measured specs 11-2.
Measured wins
K31
11
spec wins
Overall winner
Ties
4
equal specs
Optimus F3
2
spec wins
Screen size
Technology
K31
GSM / CDMA / HSPA / LTE
Optimus F3
GSM / CDMA / HSPA / EVDO / LTE
2G bands
K31
GSM 850 / 900 / 1800 / 1900 , CDMA 800 / 1900
Optimus F3
CDMA 800 / 1900 - LS720, GSM 850 / 900 / 1800 / 1900 - for T-Mobile
3G bands
K31
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
Optimus F3
CDMA2000 1xEV-DO - LS720, HSDPA 850 / 1700 / 1900 / 2100 - for T-Mobile
4G bands
K31
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
2, 4, 5, 12, 13, 25, 26, 41, 66, 71
Optimus F3
25 - LS720, 4, 17 - T-Mobile, MetroPCS
Speed
K31
HSPA, LTE
Optimus F3
HSPA 42.2/5.76 Mbps, LTE Cat3 100/50 Mbps, EV-DO Rev.A 3.1 Mbps
Announced
K31
2020, August 21. Released 2020, August 21
Optimus F3
2013, June. Released 2013, June
Status
K31
Discontinued
Optimus F3
Discontinued
Dimensions
K31
147.8 x 71.1 x 8.6 mm (5.82 x 2.80 x 0.34 in)
Optimus F3
116.1 x 62 x 10.1 mm (4.57 x 2.44 x 0.40 in)
Weight
K31
146 g (5.15 oz)
Optimus F3
113.4 g (3.99 oz)
SIM
K31
Nano-SIM + Nano-SIM
Optimus F3
Micro-SIM
Other
K31
MIL-STD-810G compliant* *does not guarantee ruggedness or use in extreme conditions
Optimus F3
-
Type
K31
IPS LCD
Optimus F3
IPS LCD
Size
K31
5.7 inches, 81.1 cm2 (~77.2% screen-to-body ratio)
Optimus F3
4.0 inches, 45.5 cm2 (~63.3% screen-to-body ratio)
Resolution
K31
720 x 1520 pixels, 19:9 ratio (~295 ppi density)
Optimus F3
480 x 800 pixels, 5:3 ratio (~233 ppi density)
Protection
K31
-
Optimus F3
Corning Gorilla Glass 2
OS
K31
Android 10, LG UX 9.1
Optimus F3
Android 4.1.2 (Jelly Bean)
Chipset
K31
Mediatek MT6762 Helio P22 (12 nm)
Optimus F3
Qualcomm MSM8930 Snapdragon 400 (28 nm)
CPU
K31
Octa-core 2.0 GHz Cortex-A53
Optimus F3
Dual-core 1.2 GHz Krait
GPU
K31
PowerVR GE8320
Optimus F3
Adreno 305
Card slot
K31
microSDXC
Optimus F3
microSDHC (dedicated slot)
Internal
K31
32GB 2GB RAM
Optimus F3
4GB 1GB RAM
Other
K31
eMMC 5.1
Optimus F3
eMMC 4.5
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 F3
-
Features
K31
LED flash, panorama, HDR
Optimus F3
LED flash, HDR, panorama
Video
K31
1080p@30fps
Optimus F3
1080p@30fps
Single
K31
-
Optimus F3
5 MP, AF
Single
K31
5 MP, f/2.2, 24mm (wide), 1/5.0", 1.12µm
Optimus F3
VGA
Video
K31
1080p@30fps
Optimus F3
Loudspeaker
K31
Yes
Optimus F3
Yes
3.5mm jack
K31
Yes
Optimus F3
Yes
WLAN
K31
Wi-Fi 802.11 b/g/n, Wi-Fi Direct
Optimus F3
Wi-Fi 802.11 b/g/n, Wi-Fi Direct, DLNA, hotspot
Bluetooth
K31
5.0, A2DP, LE
Optimus F3
4.0, A2DP
Positioning
K31
GPS
Optimus F3
GPS
NFC
K31
No
Optimus F3
Yes
Radio
K31
No
Optimus F3
No
USB
K31
microUSB 2.0
Optimus F3
microUSB 2.0
Sensors
K31
Fingerprint (rear-mounted), accelerometer
Optimus F3
Accelerometer, proximity
Type
K31
Li-Ion 3000 mAh
Optimus F3
Li-Ion 2460 mAh, removable
Stand-by
K31
-
Optimus F3
Up to 456 h
Talk time
K31
-
Optimus F3
Up to 16 h
Colors
K31
Gray
Optimus F3
Purple, Titanium, Black (T-Mobile)
Models
K31
LM-K300Q, LMK300, LGL355DL
Optimus F3
-
Price
K31
About 130 EUR
Optimus F3
About 100 EUR