Skip to content

Samsung Galaxy J7 Duo (SM-J720M) vs LG K31 (K300QM)

Side by side comparison between Samsung Galaxy J7 Duo vs LG K31 phones, differences, pros, cons with full specifications. What's the better?

,
Compare LG K31 XSamsung Galaxy J7 Duo (SM-J720M)12Points
Samsung Galaxy J7 Duo (SM-J720M)
5.5"
AMOLED

720x1280

13
MP

8mp

3GB
RAM

64bit Octa

3000
mAh

(Removable)

vs
LG K31 (K300QM)
5.7"
IPS

720x1520

13
MP

5mp

2GB
RAM

64bit Octa

3000
mAh

(Non removable)

What's the better phone? Samsung Galaxy J7 Duo (SM-J720M)

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!

Galaxy J7 Duo (SM-J720M)12 Advantages Samsung Galaxy J7 Duo (SM-J720M)vsK31 (K300QM)12 Advantages LG K31 (K300QM)
+3GB LPDDR450%
More RAM memory. Typically more responsive and better for multitasking.
vs2GB LPDDR3
+32GB (21GB available)24%
More internal storage for applications and files
vs32GB (17GB available)
+8.2 millimeters (0.32 inches)5%
Thinner
vs8.6 millimeters (0.34 inches)
+Super AMOLEDAdvantage
Super AMOLED display is brighter and more vivid
vsTFT IPS LCD
+LED flash on both camerasAdvantage
The LED flash on both cameras helps in dark places or in low light
vsLED flash
+(front) 8MP63%
Higher resolution secondary camera to take pictures and selfies
vs(front) 5MP
+Proximity sensorAdvantage
Sensors help you use the device
vsNot supported
+Face unlockAdvantage
Sensors help you use the device
vsNot supported
+ANT+Advantage
Sensors help you use the device
vsNot supported
+Li-Ion: Lithium-Ion (Removable)Advantage
Removable battery can be replaced easily
vsLi-Ion: Lithium-Ion (Non removable)
+FMAdvantage
The radio lets you listen to your songs and sports in general
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)
2.2Ghz 64bit Octa-Corevs+2Ghz 64bit Octa-Core1%
More powerful processor, you can open your applications faster
Until 256GB microSD, microSDXCvs+Until 512GB microSD, microSDXC100%
More external storage for files using memory cards
174 grams (6.09 ounces)vs+146 grams (5.11 ounces)19%
Lighter
720x1280 pixelsvs+720x1520 pixels19%
Higher resolution screen
267 PPIvs+295 PPI10%
Crisper display of text, images and videos because it has more pixels per inch (ppi)
5.5"vs+5.7"4%
Larger screen
HDR photo only main cameravs+HDR photo on both camerasAdvantage
The HDR technology produced photos with more detail in dark areas
f/1.9 (aperture)vs+f/1.8 (aperture)6%
Diaphragm opening (Aperture) of the camera which has the smallest F number takes photos with better light exposure.
Android 9.0 Pievs+Android 10Advantage
Android 10 is newer and safer
Not supportedvs+Active noise cancellationAdvantage
Noise-canceling microphone allows better call quality
Not supportedvs+Panda King GlassAdvantage
Protection against scratches on the screen lets you carry your phone with your keys
Not supportedvs+MIL-STD-810G military certifiedAdvantage
Protection against water allows you talk to your friends in the rain, for example

24 Common items in both devices
eMMC 5.1
Plastic body, glass front
16 million
(dual camera) 13MP + 5MP
Only digital zoom
Autofocus / PDAF: phase detection autofocus
EIS: Digital stabilization
+17 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 featuresSamsung Galaxy J7 Duo (SM-J720M)LG K31 (K300QM)
ModelGalaxy J7 Duo (SM-J720M)K31 (K300QM)
Other model namesGalaxy J7 Duo J720M Single-Sim, Samsung J720LG K31 (Unlocked), LMK300QMAUSASV, LM-K300Q
Country or region available(Latin America)
(Latin America)
USA
USA
BrandSamsungLG
Release dateApril, 2018August, 2020
Depth8.2 millimeters (0.32 inches)8.6 millimeters (0.34 inches)
Size (width x height)77.2 x 153.5 millimeters (3.04 x 6.04 in)71.12 x 147.83 millimeters (2.8 x 5.82 in)
Weight174 grams (6.09 ounces)146 grams (5.11 ounces)
Qwerty physical keyboardNot supportedNot supported
AntennaInternal antennaInternal antenna
Build, materialsPlastic body, glass frontPlastic body, glass front
Protection against water and othersNot supportedMIL-STD-810G military certified: salt, dust, humidity, rain, vibration, solar radiation, transport and thermal shock resistant.
System (OS)Samsung Galaxy J7 Duo (SM-J720M)LG K31 (K300QM)
Operating systemAndroid 8.0 OreoAndroid 10
Firmware updateAndroid 9.0 Piefeature not registered
HardwareSamsung Galaxy J7 Duo (SM-J720M)LG K31 (K300QM)
Chipset64bit - Samsung Exynos 7 Octa 7885 (14nm)64bit - MediaTek MT6762 Helio P22 (12nm)
CPU processorOcta-Core, 2 processors:
2.2Ghz Dual-Core ARM Cortex-A73
1.6Ghz Hexa-Core ARM Cortex-A53
Octa-Core, 2 processors:
2Ghz Quad-Core ARM Cortex-A53
1.5Ghz Quad-Core ARM Cortex-A53
GPU graphical controllerARM Mali-G71 MP2PowerVR GE8320 650Mhz
RAM memory3GB LPDDR42GB LPDDR3
Internal storage32GB (21GB available)
eMMC 5.1
32GB (17GB available)
eMMC 5.1
External storageUntil 256GB microSD, microSDXC
(dedicated slot)
Until 512GB microSD, microSDXC
(dedicated slot)
DisplaySamsung Galaxy J7 Duo (SM-J720M)LG K31 (K300QM)
Display typeSuper AMOLEDTFT IPS LCD
Screen size5.5" inches5.7" inches
Screen-to-body ratio~70.4% (screen-to-body ratio)~77.1% (screen-to-body ratio)
Display resolution720x1280 pixels720x1520 pixels (19:9)
TouchscreenCapacitive MultitouchCapacitive Multitouch
Pixel density (dot pitch)267 PPI295 PPI
Colors16 million16 million
Scratch-resistant glassNot supportedPanda King Glass
Display featuresfeature not registered60Hz
Mobile networksSamsung Galaxy J7 Duo (SM-J720M)LG K31 (K300QM)
Dual-SIMNot supportedNot supported
SIM card1 slot (Single-SIM)
micro-SIM (3FF)
1 slot (Single-SIM)
nano-SIM (4FF)
Maximum download/upload150/50 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 850/900/1800/1900CDMA 800/1900, GSM 850/900/1800/1900
Primary 3G networkUMTS 850/900/1700/1900/2100CDMA2000 1xEV-DO
UMTS 850/900/1700/1900/2100
Primary 4G networkLTE Cat (Bands 1,3,4,5,7,8,12,13,17,28,66)
TD-LTE (Bands 38,40,41)
LTE Cat4 (2, 4, 5, 12, 13, 25, 26, 66, 71)
TD-LTE (41)
Primary 5G networkNot supportedNot supported
Primary data networkGPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTEGPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE
Secondary 2G networkNot supportedNot supported
Secondary 3G networkNot supportedNot supported
Secondary 4G networkNot supportedNot supported
Secondary data networkNot supportedNot supported
CallingSamsung Galaxy J7 Duo (SM-J720M)LG K31 (K300QM)
MessagingSMS (T9), MMS, E-mail, Push mailSMS (T9), MMS, E-mail, Push mail
SpeakerphoneSupportedSupported
Video callingSupportedSupported
Call controlVoice dialing, Voice recorderVoice dialing, Voice recorder, Voice commands
CameraSamsung Galaxy J7 Duo (SM-J720M)LG K31 (K300QM)
Back camera (main camera)(dual camera)
13 megapixels
5MP depthf/1.9
(dual camera)
13 megapixels
5MP ultrawidef/2.2120º1/5.0"1.12µm
Main camera resolution4128x3096 pixels4128x3096 pixels
Video recording (primary)Full HD (1920x1080) 30 fpsFull HD (1920x1080) 30 fps
FlashLED flash on both camerasLED flash
Focal aperturef/1.9 (aperture)f/1.8 (aperture)
Focal lengthfeature not registered27mm lens
Sensor sizefeature not registered1/3.1" inches
Pixel sizefeature not registered1.12µm pixel
AutofocusAutofocusPDAF: phase detection autofocus
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 only main cameraHDR photo on both cameras
2ª cameraSamsung Galaxy J7 Duo (SM-J720M)LG K31 (K300QM)
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/1.9 (aperture)f/2.2 (aperture)
Focal lengthfeature not registered24mm lens
Sensor sizefeature not registered1/5" inches
Pixel sizefeature not registered1.12µm pixel
MultimediaSamsung Galaxy J7 Duo (SM-J720M)LG K31 (K300QM)
RadioFMNot supported
TVNot supportedNot supported
Video formatsMP4, H.264, H.263, XviD, MKVMP4, H.265, H.264, H.263, XviD, MKV
Audio formatsMP3, WAV, WMA, eAAC+, FLACMP3, WAV, WMA, eAAC+, FLAC
ConnectivitySamsung Galaxy J7 Duo (SM-J720M)LG K31 (K300QM)
USBMicroUSB 2.0MicroUSB 2.0
TV outputNot supportedNot supported
Audio output3.5mm jack3.5mm jack
Bluetooth5.0 + A2DP/LE5.0 + A2DP/LE
WiFi802.11 a/b/g/n/ac (2.4Ghz, 5Ghz) + MIMO802.11 b/g/n (2.4Ghz)
DLNANot supportedNot supported
NFCNot supportedNot supported
GPSA-GPS, GeoTagging, GLONASS, BeiDouA-GPS, GeoTagging
Infrared portNot supportedNot supported
Other functionsSamsung Galaxy J7 Duo (SM-J720M)LG K31 (K300QM)
Active noise cancellationNot supportedSupported
Vibrating alertSupportedSupported
RingtonesPolyphonic and customizedPolyphonic and customized
Web browserHTML, XHTML, HTML5HTML, XHTML, HTML5
SensorsAccelerometer
Proximity sensor
Face unlock
Fingerprint sensor (front-mounted)
ANT+
Accelerometer
Fingerprint sensor (rear-mounted)
Other features- Colors: Black, Gold, Rose Gold, White
- Samsung Pay
- WiFi direct, hotspot
- Colors: Silver
- LG UX 9.1
- WiFi direct, hotspot
Power supplySamsung Galaxy J7 Duo (SM-J720M)LG K31 (K300QM)
BatteryLi-Ion: Lithium-Ion (Removable)Li-Ion: Lithium-Ion (Non removable)
Battery capacity3000 mAh3000 mAh
Charger, watts Standard charging Standard charging
Talk time autonomy1200 minutes | 20 hours | 0.8 day660 minutes | 11 hours | 0.5 day
Standbyfeature not registered31680 minutes | 528 hours | 22 days
Radiation rateSamsung Galaxy J7 Duo (SM-J720M)LG K31 (K300QM)
SAR 1.6W/kg (USA, Mexico, etc.)0.97W/kg (head) | 0.55W/kg (body)0.61W/kg (head) | 1.13W/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.