Skip to content

LG K40 (X420EM) vs Samsung Galaxy J3 2018 (SM-J337U)

Side by side comparison between LG K40 vs Samsung Galaxy J3 (2018) phones, differences, pros, cons with full specifications. What's the better?

,
LG K40 (X420EM)
5.7"
IPS

720x1440

16
MP

8mp

2GB
RAM

64bit Octa

3000
mAh

(Non removable)

vs
06PointsSamsung Galaxy J3 2018 (SM-J337U)Compare LG K40 X
Samsung Galaxy J3 2018 (SM-J337U)
5"
IPS

720x1280

8
MP

5mp

2GB
RAM

64bit Quad

2600
mAh

(Removable)

What's the better phone? LG K40 (X420EM)

The phonemore's choice is much more technical than personal. Therefore, you shouldn't only consider this. Our goal is to help you, but what's important to us may not be important to you. You decide which one is the best! Comment!

K40 (X420EM)22 Advantages LG K40 (X420EM)vsGalaxy J3 2018 (SM-J337U)6 Advantages Samsung Galaxy J3 2018 (SM-J337U)
+2Ghz 64bit Octa-Core62%
More powerful processor, you can open your applications faster
vs1.4Ghz 64bit Quad-Core
+32GB (20GB available)122%
More internal storage for applications and files
vs16GB (9GB available)
+eMMC 5.1Advantage
Fastest write and read storage.
vseMMC 5.0
+145 grams (5.08 ounces)5%
Lighter
vs152 grams (5.32 ounces)
+8.3 millimeters (0.33 inches)8%
Thinner
vs9 millimeters (0.35 inches)
+720x1440 pixels13%
Higher resolution screen
vs720x1280 pixels
+5.7"14%
Larger screen
vs5"
+(back) 16MP99%
Higher resolution main camera
vs(back) 8MP
+LED flash on both camerasAdvantage
The LED flash on both cameras helps in dark places or in low light
vsLED flash
+HDR photo on both camerasAdvantage
The HDR technology produced photos with more detail in dark areas
vsHDR photo only main camera
+(front) 8MP63%
Higher resolution secondary camera to take pictures and selfies
vs(front) 5MP
+Android 8.1 OreoAdvantage
Android 8.1 Oreo is newer and safer
vsAndroid 8.0 Oreo
+(4G+ LTE-A) 300 Mbps100%
Faster for surfing the internet and download files
vs(4G LTE) 150 Mbps
+Ambient Light sensorAdvantage
Sensors help you use the device
vsNot supported
+Fingerprint sensor (rear-mounted)Advantage
Sensors help you use the device
vsNot supported
+3000 mAh15%
Battery - higher amperage (mAh) allows more device usage time, but it also depends on the hardware and use
vs2600 mAh
+Active noise cancellationAdvantage
Noise-canceling microphone allows better call quality
vsNot supported
+802.11 a/b/g/n/ac (2.4Ghz, 5Ghz) + MIMOAdvantage
WiFi 802.11 a/b/g/n/ac (2.4Ghz, 5Ghz) + MIMO is newer and faster
vs802.11 b/g/n (2.4Ghz)
+DLNAAdvantage
With DLNA technology you can access and play media files on TV, tablet or DLNA compatible device.
vsNot supported
+5.0 + A2DP/LEAdvantage
Bluetooth 5.0 + A2DP/LE is newer and faster
vs4.2 + A2DP
+NFCAdvantage
NFC allows you to make payments by approach quickly and securely
vsNot supported
+MIL-STD-810G military certifiedAdvantage
Protection against water allows you talk to your friends in the rain, for example
vsNot supported
282 PPIvs+294 PPI4%
Crisper display of text, images and videos because it has more pixels per inch (ppi)
f/2.0 (aperture)vs+f/1.9 (aperture)5%
Diaphragm opening (Aperture) of the camera which has the smallest F number takes photos with better light exposure.
Not supportedvs+CompassAdvantage
Sensors help you use the device
Not supportedvs+GyroscopeAdvantage
Sensors help you use the device
Li-Ion: Lithium-Ion (Non removable)vs+Li-Ion: Lithium-Ion (Removable)Advantage
Removable battery can be replaced easily
Not supportedvs+FMAdvantage
The radio lets you listen to your songs and sports in general

22 Common items in both devices
2GB LPDDR3
Until 1TB microSD, microSDXC / Until 512GB microSD, microSDXC
Plastic body, glass front
TFT IPS LCD
16 million
Only digital zoom
PDAF: phase detection autofocus / Autofocus
+15 specs and more in the table below

Check the comparison table below for more items that are not evaluated in comparison score above.

Highlight differencesClear highlight
Physical featuresLG K40 (X420EM)Samsung Galaxy J3 2018 (SM-J337U)
ModelK40 (X420EM)Galaxy J3 2018 (SM-J337U)
Other model namesLG K40 LMX420EM NFC Single-sim, LM-X420EM, LG-LMX420EMGalaxy J3 (2018) Unlocked SM-J337UZKAXAA
Country or region available(Europe)
(Europe)
USA
USA
BrandLGSamsung
Release dateMarch, 2019May, 2018
Depth8.3 millimeters (0.33 inches)9 millimeters (0.35 inches)
Size (width x height)71.9 x 153 millimeters (2.83 x 6.02 in)70.2 x 142.8 millimeters (2.76 x 5.62 in)
Weight145 grams (5.08 ounces)152 grams (5.32 ounces)
Qwerty physical keyboardNot supportedNot supported
AntennaInternal antennaInternal antenna
Build, materialsPlastic body, glass frontPlastic body, glass front
Protection against water and othersMIL-STD-810G military certified: salt, dust, humidity, rain, vibration, solar radiation, transport and thermal shock resistant.Not supported
System (OS)LG K40 (X420EM)Samsung Galaxy J3 2018 (SM-J337U)
Operating systemAndroid 8.1 OreoAndroid 8.0 Oreo
Firmware updatefeature not registeredfeature not registered
HardwareLG K40 (X420EM)Samsung Galaxy J3 2018 (SM-J337U)
Chipset64bit - MediaTek MT6762 Helio P22 (12nm)64bit - Samsung Exynos 7 Quad 7570 (14nm)
CPU processorOcta-Core, 2 processors:
2Ghz Quad-Core ARM Cortex-A53
1.5Ghz Quad-Core ARM Cortex-A53
1.4Ghz Quad-Core ARM Cortex-A53
GPU graphical controllerPowerVR GE8320 650MhzARM Mali-T720 MP2
RAM memory2GB LPDDR32GB LPDDR3
Internal storage32GB (20GB available)
eMMC 5.1
16GB (9GB available)
eMMC 5.0
External storageUntil 1TB microSD, microSDXC
(dedicated slot)
Until 512GB microSD, microSDXC
(dedicated slot)
DisplayLG K40 (X420EM)Samsung Galaxy J3 2018 (SM-J337U)
Display typeTFT IPS LCDTFT IPS LCD
Screen size5.7" inches5" inches
Screen-to-body ratio~76.2% (screen-to-body ratio)~68.8% (screen-to-body ratio)
Display resolution720x1440 pixels720x1280 pixels
TouchscreenCapacitive MultitouchCapacitive Multitouch
Pixel density (dot pitch)282 PPI294 PPI
Colors16 million16 million
Scratch-resistant glassNot supportedNot supported
Display featuresfeature not registeredfeature not registered
Mobile networksLG K40 (X420EM)Samsung Galaxy J3 2018 (SM-J337U)
Dual-SIMNot supportedNot supported
SIM card1 slot (Single-SIM)
nano-SIM (4FF)
1 slot (Single-SIM)
nano-SIM (4FF)
Maximum download/upload300/50 Mbps150/50 Mbps
Network technology2G, 3G, 4G2G, 3G, 4G
Frequency, bandsExpand band detailsCollapse details
GSM Mhz bandQuad-Band 850/900/1800/1900Quad-Band 850/900/1800/1900
Primary 2G networkGSM 850/900/1800/1900GSM 850/900/1800/1900
Primary 3G networkUMTS 850/900/1900/2100UMTS 850/900/1700/1900/2100
Primary 4G networkLTE Cat6 (Bands 1, 3, 5, 7, 8, 20)
TD-LTE (Bands 38)
LTE Cat4 (Bands 2, 3, 4, 5, 7, 12, 14)
Primary 5G networkNot supportedNot supported
Primary data networkGPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-AGPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, LTE
Secondary 2G networkNot supportedNot supported
Secondary 3G networkNot supportedNot supported
Secondary 4G networkNot supportedNot supported
Secondary data networkNot supportedNot supported
CallingLG K40 (X420EM)Samsung Galaxy J3 2018 (SM-J337U)
MessagingSMS (T9), MMS, E-mail, Push mailSMS (T9), MMS, E-mail, Push mail
SpeakerphoneSupportedSupported
Video callingSupportedSupported
Call controlVoice dialing, Voice recorderVoice dialing, Voice recorder
CameraLG K40 (X420EM)Samsung Galaxy J3 2018 (SM-J337U)
Back camera (main camera)16 megapixels8 megapixels
Main camera resolution4608x3456 pixels3264x2448 pixels
Video recording (primary)Full HD (1920x1080) 30 fpsFull HD (1920x1080) 30 fps
FlashLED flash on both camerasLED flash
Focal aperturef/2.0 (aperture)f/1.9 (aperture)
Focal lengthfeature not registeredfeature not registered
Sensor size1/3" inchesfeature not registered
Pixel size1µm pixelfeature not registered
AutofocusPDAF: phase detection autofocusAutofocus
Touch focusSupportedSupported
Image stabilizationEIS: Digital stabilizationEIS: Digital stabilization
ZoomOnly digital zoomOnly digital zoom
Face/smile detectionFace detection, Smile detectionFace detection, Smile detection
BSI sensorNot supportedNot supported
HDRHDR photo on both camerasHDR photo only main camera
2ª cameraLG K40 (X420EM)Samsung Galaxy J3 2018 (SM-J337U)
Front camera (secondary)8 megapixels5 megapixels
Front camera resolution3264x2448 pixels2560x1920 pixels
Video recording (secondary)Full HD (1920x1080)Full HD (1920x1080)
Front flashLEDNot supported
Focal aperturef/2.0 (aperture)f/2.2 (aperture)
Focal lengthfeature not registeredfeature not registered
Sensor sizefeature not registeredfeature not registered
Pixel sizefeature not registeredfeature not registered
MultimediaLG K40 (X420EM)Samsung Galaxy J3 2018 (SM-J337U)
RadioNot supportedFM
TVNot supportedNot supported
Video formatsMP4, H.264, H.263, XviD, MKVMP4, H.264, H.263, XviD, MKV
Audio formatsMP3, WAV, WMA, eAAC+, FLACMP3, WAV, WMA, eAAC+, FLAC
ConnectivityLG K40 (X420EM)Samsung Galaxy J3 2018 (SM-J337U)
USBMicroUSB 2.0, USB OTG On-The-GoMicroUSB 2.0
TV outputNot supportedNot supported
Audio output3.5mm jack3.5mm jack
Bluetooth5.0 + A2DP/LE4.2 + A2DP
WiFi802.11 a/b/g/n/ac (2.4Ghz, 5Ghz) + MIMO802.11 b/g/n (2.4Ghz)
DLNASupportedNot supported
NFCSupportedNot supported
GPSA-GPS, GeoTaggingA-GPS, GeoTagging, GLONASS
Infrared portNot supportedNot supported
Other functionsLG K40 (X420EM)Samsung Galaxy J3 2018 (SM-J337U)
Active noise cancellationSupportedNot supported
Vibrating alertSupportedSupported
RingtonesPolyphonic and customizedPolyphonic and customized
Web browserHTML, XHTML, HTML5HTML, XHTML, HTML5
SensorsAccelerometer
Proximity sensor
Ambient Light sensor
Fingerprint sensor (rear-mounted)
Accelerometer
Proximity sensor
Compass
Gyroscope
Other features- Colors: Black, Moroccan Blue, Platinum Gray
- 18:9 ratio FullVision display
- LED notification
- DTS-X Surround sound
- WiFi direct, hotspot
- Colors: Black
- WiFi direct, hotspot
Power supplyLG K40 (X420EM)Samsung Galaxy J3 2018 (SM-J337U)
BatteryLi-Ion: Lithium-Ion (Non removable)Li-Ion: Lithium-Ion (Removable)
Battery capacity3000 mAh2600 mAh
Charger, watts Standard charging Standard charging
Talk time autonomy480 minutes | 8 hours | 0.3 dayfeature not registered
Standby6000 minutes | 100 hours | 4.2 daysfeature not registered
Radiation rateLG K40 (X420EM)Samsung Galaxy J3 2018 (SM-J337U)
SAR 1.6W/kg (USA, Mexico, etc.)feature not registered1.2W/kg (head) | 1.58W/kg (body)
SAR 2W/kg (Europe, UK, etc.)feature not registeredfeature not registered
X

We use cookies to provide and improve our services. By using our site, you consent to cookies. See more details: Privacy policy.