LG X400 (K121S) vs Realme X2 Pro (128GB)

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Side by side comparison between LG X400 vs Realme X2 Pro phones, differences, pros, cons and full specifications. What's the better?

11/15/2019 3:11 PM, updated: 10/24/2021 5:21 PM

Compare Realme X2 Pro X LG X400 (K121S) 06Points

Specifications Compare Models Pictures

5.3"
IPS

720x1280

13
MP

5mp

2GB
RAM

Octa-core

2800
mAh

(Removable)

25Points Realme X2 Pro (128GB) Compare LG X400 X

Specifications Compare Models Pictures

6.5"
AMOLED

1080x2400

64.1
MP

16mp

8GB
RAM

Octa-core

4000
mAh

(Non removable)

What's the better phone? Realme X2 Pro (128GB)

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!

6 Advantages LG X400 (K121S)	vs	25 Advantages Realme X2 Pro (128GB)
+Until 256GB microSD, microSDXCAdvantage More external storage for files using memory cards	vs	Not supported
+142 grams (4.97 ounces)40% Lighter	vs	199 grams (6.97 ounces)
+8 millimeters (0.31 inches)9% Thinner	vs	8.7 millimeters (0.34 inches)
+(4G LTE-A) 300 Mbps100% Faster for surfing the internet and download files	vs	(4G LTE) 150 Mbps
+Li-Ion: lithium-ion (Removable)Advantage Removable battery can be replaced easily	vs	LiPo: li-ion polymer (Non removable)
+Digital TVAdvantage Watch your favorite TV shows anywhere	vs	Not supported
1.5GHz 64bit Octa-core	vs	+2.96GHz 64bit Octa-core (7nm)107% More powerful processor, you can open your applications faster
2GB LPDDR3	vs	+8GB LPDDR4X3 times More RAM memory. Typically more responsive and better for multitasking.
32GB (22GB available)	vs	+128GB (110GB available)4 times More internal storage for applications and files
Plastic body, glass front	vs	+Aluminum frame, glass front/backAdvantage More resistant material
TFT IPS LCD	vs	+Super AMOLEDAdvantage Super AMOLED display is brighter and more vivid
720x1280 pixels	vs	+1080x2400 pixels181% Higher resolution screen
277 PPI	vs	+405 PPI46% Crisper display of text, images and videos because it has more pixels per inch (ppi)
5.3"	vs	+6.5"23% Larger screen
(back) 13MP	vs	+(quad camera) 64.1MP + 13MP + 8MP + 2MP6 times Higher resolution main camera
LED flash	vs	+Dual-LED flashAdvantage The Dual-LED flash helps in dark places or in low light
Only digital zoom	vs	+Digital and optical zoomAdvantage The zoom allows for better focus and approach to take pictures
HDR photo only main camera	vs	+HDR photo on both camerasAdvantage The HDR technology produced photos with more detail in dark areas
1/3" inches	vs	+1/1.7" inches76% The larger sensor camera lets you take photos with better depth.
f/2.2 (aperture)	vs	+f/1.8 (aperture)22% Diaphragm opening (Aperture) of the camera which has the smallest F number takes photos with better light exposure.
(front) 5MP	vs	+(front) 16MP2 times Higher resolution secondary camera to take pictures and selfies
Full HD (1920x1080)	vs	+4K UHD (3840x2160)3 times More image quality for recording videos with the primary camera
Android 8.0 Oreo	vs	+Android 10Advantage Android 10 is newer and safer
Not supported	vs	+Face unlock 2DAdvantage Sensors help you use the device
Not supported	vs	+GyroscopeAdvantage Sensors help you use the device
2800 mAh	vs	+4000 mAh43% Battery - higher amperage (mAh) allows more device usage time, but it also depends on the hardware and use
1 slot (Single-SIM) (dedicated slot)	vs	+2 slots (Dual-SIM)Advantage You can have more mobile carriers/operators on the same device.
802.11 b/g/n [wifi4]	vs	+802.11 a/b/g/n/ac [wifi5]Advantage WiFi 802.11 a/b/g/n/ac [wifi5] is newer and faster
4.2 + A2DP	vs	+5.0 + A2DP/LEAdvantage Bluetooth 5.0 + A2DP/LE is newer and faster
MicroUSB 2.0, USB OTG On-The-Go	vs	+Type-CAdvantage Reversible connector, you can stick in a USB-C cable any which way; either side is up.
Not supported	vs	+Gorilla Glass 5Advantage Protection against scratches on the screen lets you carry your phone with your keys

22 Common items in both devices

16 million

Autofocus / PDAF: phase detection autofocus

EIS: Digital stabilization

(front) Full HD (1920x1080)

4G LTE-A / 4G LTE

Capacitive

Multitouch

+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 differences

📱 Model features
	LG X400 (K121S)	Realme X2 Pro (128GB)
Change model		Choose the model
Model	X400 (K121S)	Realme X2 Pro (128GB)
Other model names	SKT LG X400, LGM-K121S, LGMK121S (SK Telecom)	Oppo Realme X2 Pro RMX1931 (8GB RAM + 128GB)
Country or region available	South Korea	(Europe), (Global, International), China
Brand	LG	Realme
Release date	2/1/2017	10/1/2019
Depth	8 millimeters (0.31 inches)	8.7 millimeters (0.34 inches)
Size (width x height)	75.29 x 148.7 millimeters (2.96 x 5.85 in)	75.7 x 161 millimeters (2.98 x 6.34 in)
Weight	142 grams (4.97 ounces)	199 grams (6.97 ounces)
Build, materials	Plastic body, glass front	Aluminum frame, glass front/back
Protection against water and others	Not supported	Not supported
📲 Display
	LG X400 (K121S)	Realme X2 Pro (128GB)
Display type	TFT IPS LCD	Super AMOLED
Screen size	5.3" inches	6.5" inches
Screen-to-body ratio	~69.2% (screen-to-body ratio)	~83.7% (screen-to-body ratio)
Display resolution	720x1280 pixels	1080x2400 pixels (20:9)
Touchscreen	Capacitive Multitouch	Capacitive Multitouch
Pixel density (dot pitch)	277 PPI	405 PPI
Colors	16 million	16 million
Scratch-resistant glass	Not supported	Gorilla Glass 5
Refresh rate	feature not registered	90Hz
Display features	feature not registered	1000nits[peak] HDR10+
🤖 Operating System
	LG X400 (K121S)	Realme X2 Pro (128GB)
System version	Android 7.0 Nougat	Android 9.0 Pie
Firmware update	Android 8.0 Oreo	Android 10
User Interface	feature not registered	feature not registered
⚙️ Processor
	LG X400 (K121S)	Realme X2 Pro (128GB)
Chipset	64bit: MediaTek MT6750 (28nm)	64bit: Qualcomm Snapdragon 855+ (SM8150-AC) (7nm)
CPU	Octa-core, 2 processors: 4x 1.5GHz ARM Cortex-A53 (Quad-core) 4x 1GHz ARM Cortex-A53 (Quad-core)	Octa-core, 3 processors: 1x 2.96GHz Kryo 485 (Single-core) 3x 2.42GHz Kryo 485 (Triple-core) 4x 1.8GHz Kryo 485 (Quad-core)
GPU graphical controller	ARM Mali-T860 MP2 520Mhz	Qualcomm Adreno 640 (672MHz)
Performance (benchmark)	feature not registered	feature not registered
💽 Memory and storage
	LG X400 (K121S)	Realme X2 Pro (128GB)
RAM memory	2GB LPDDR3	8GB LPDDR4X
Internal storage	32GB (22GB available)	128GB (110GB available) UFS 3.0
External storage	Until 256GB microSD, microSDXC (dedicated slot)	Not supported
📶 Mobile networks
	LG X400 (K121S)	Realme X2 Pro (128GB)
Dual-SIM	Not supported	Dual-SIM Standby - Call active on one sim card
SIM card	1 slot (Single-SIM) nano-SIM (4FF)	2 slots (Dual-SIM) nano-SIM (4FF)
Maximum Download / Upload	300/50 Mbps	150/50 Mbps
Network technology	2G, 3G, 4G	2G, 3G, 4G
Frequency, bands	Expand band details Collapse details
GSM MHz band	Tri-Band 900/1800/1900	Quad-Band 850/900/1800/1900
Primary 2G network	GSM 900/1800/1900	CDMA 800, GSM 850/900/1800/1900
Primary 3G network	UMTS 2100	CDMA2000 1xEV-DO TD-SCDMA 1900/2000 UMTS 850/900/1700/1900/2100
Primary 4G network	LTE Cat6 850/900/1800/2100/2600 (Bands 1,3,5,7,8) VoLTE	LTE Cat4 (Bands 1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26) TD-LTE (Bands 34, 38, 39, 40, 41) VoLTE
Primary 5G network	Not supported	Not supported
Primary data network	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, LTE, LTE-A	GPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, TD-SCDMA, UMTS, TD-HSDPA, HSDPA, HSUPA, HSPA+, TD-LTE, LTE
Secondary 2G network	Not supported	GSM 850/900/1800/1900
Secondary 3G network	Not supported	Not supported
Secondary 4G network	Not supported	Not supported
Secondary data network	Not supported	GPRS, EDGE
📷 Camera
	LG X400 (K121S)	Realme X2 Pro (128GB)
Back camera (main camera)	13 megapixels	(quad camera) 64.1 megapixels 13MP telephoto f/2.552mm1/3.4"1.0µmPDAF2x-optical-zoom 8MP ultrawide f/2.216mm1/3.2"1.4µmPDAF 2MP depth f/2.41/5"1.75µm
Main camera resolution	4160x3120 pixels	9248x6936 pixels
Video recording (primary)	Full HD (1920x1080) 30 fps	4K UHD (3840x2160) 60 fps
Flash	LED flash	Dual-LED flash
Focal aperture	f/2.2 (aperture)	f/1.8 (aperture)
Focal length	feature not registered	26mm (lens)
Sensor size	1/3" inches	1/1.7" inches
Pixel size	1.12µm pixel	0.8µm pixel
Autofocus	Autofocus	PDAF: phase detection autofocus
Touch focus	Supported	Supported
Image stabilization	EIS: Digital stabilization	EIS: Digital stabilization
Zoom	Only digital zoom	Digital and optical zoom
Face/smile detection	Face detection, Smile detection	Face detection, Smile detection
BSI sensor	Not supported	Not supported
HDR	HDR photo only main camera	HDR photo on both cameras
Camera extras	feature not registered	feature not registered
📸 Front camera
	LG X400 (K121S)	Realme X2 Pro (128GB)
Front camera (secondary)	5 megapixels	16 megapixels
Front camera resolution	2560x1920 pixels	4608x3456 pixels
Video recording (secondary)	Full HD (1920x1080)	Full HD (1920x1080)
Front flash	Not supported	Not supported
Focal aperture	f/2.4 (aperture)	f/2.0 (aperture)
Focal length	feature not registered	feature not registered
Sensor size	1/5" inches	feature not registered
Pixel size	1.12µm pixel	1µm pixel
🔉 Sound and multimedia
	LG X400 (K121S)	Realme X2 Pro (128GB)
Loudspeaker	Supported	Supported
Active noise cancellation	2 microphones or more	2 microphones or more
Radio	FM (RDS)	FM
TV	Digital TV	Not supported
Video formats	MP4, H.264, H.263, XviD, MKV	MP4, H.265, H.264, H.263, XviD, MKV
Audio formats	MP3, WAV, WMA, eAAC+, FLAC	MP3, WAV, WMA, eAAC+, FLAC
🔌 Connectivity
	LG X400 (K121S)	Realme X2 Pro (128GB)
USB	MicroUSB 2.0, USB OTG On-The-Go	USB 2.0 Type-C, USB OTG On-The-Go
Audio output	3.5mm jack	3.5mm jack
TV output	Not supported	Not supported
Bluetooth	4.2 + A2DP	5.0 + A2DP/LE
WiFi	802.11 b/g/n [wifi4] (2.4GHz) WiFi Direct, hotspot	802.11 a/b/g/n/ac [wifi5] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot
DLNA	Not supported	Not supported
GPS	A-GPS, GeoTagging, GLONASS	A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou
NFC	Supported	Supported
Infrared port	Not supported	Not supported
🧭 Sensors
	LG X400 (K121S)	Realme X2 Pro (128GB)
Sensors	Accelerometer Ambient light sensor Compass Fingerprint sensor (rear-mounted) Proximity sensor	Accelerometer Ambient light sensor Compass Face unlock 2D Fingerprint sensor (under display) Gyroscope Proximity sensor
Vibrating alert	Supported	Supported
🔋 Battery
	LG X400 (K121S)	Realme X2 Pro (128GB)
Battery type	Li-Ion: lithium-ion (Removable)	LiPo: li-ion polymer (Non removable)
Battery capacity	2800 mAh	4000 mAh
Charger, watts	Wired charging	50W Wired fast charging
Inductive / wireless charging	feature not registered	Not supported
Talk time autonomy	9 hours	feature not registered
Standby	390 hours (16.3 days)	feature not registered
➕ Other features
	LG X400 (K121S)	Realme X2 Pro (128GB)
Call control	Voice dialing, Voice recorder	Voice dialing, Voice recorder, Voice commands
Messaging	SMS (T9), MMS, E-mail, Push mail	SMS (T9), MMS, E-mail, Push mail
Hands-free calling	Supported	Supported
Video calling	Supported	Supported
Ringtones	Polyphonic and customized	Polyphonic and customized
Web browser	HTML, XHTML, HTML5	HTML, XHTML, HTML5
Antenna	Internal antenna	Internal antenna
Qwerty physical keyboard	Not supported	Not supported
Miscellaneous	• Colors: Black, Gold • 2.5D Arc Glass screen • LG UX 5.0 • Wide-angle 120° front camera • KnockOn, Knock Code • DMB-TV (Korea)	• Colors: Lunar White, Neptune Blue, Red Master Edition, Gray Master Edition • ColorOS 6.1 • DCI-P3 100% display • Dolby Atmos (24-bit/192kHz) • SuperVOOC Flash Charge: 100% in 35min
☢️ Radiation rate
	LG X400 (K121S)	Realme X2 Pro (128GB)
SAR 1.6W/kg (USA, Mexico, etc.)	feature not registered	feature not registered
SAR 2W/kg (Europe, UK, etc.)	feature not registered	feature not registered