LG G4 (Dual H818P) vs Samsung Galaxy S21 Ultra (SM-G998U1 256GB)

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Side by side comparison between LG G4 vs Samsung Galaxy S21 Ultra phones, differences, pros, cons and full specifications. What's the better?

11/14/2021 5:17 PM, updated: 5/19/2025 11:26 AM

Compare Samsung Galaxy S21 Ultra X LG G4 (Dual H818P) 05Points

Specifications Compare Models Pictures

5.5"
IPS

1440x2560

16
MP

8mp

3GB
RAM

Hexa-core

3000
mAh

(Removable)

35Points Samsung Galaxy S21 Ultra (SM-G998U1 256GB) Compare LG G4 X

Specifications Compare Models Pictures

6.8"
AMOLED

1440x3200

108
MP

40mp

12GB
RAM

Octa-core

5000
mAh

(Non removable)

What's the better phone? Samsung Galaxy S21 Ultra (SM-G998U1 256GB)

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!

5 Advantages LG G4 (Dual H818P)	vs	35 Advantages Samsung Galaxy S21 Ultra (SM-G998U1 256GB)
+Until 128GB microSD, microSDXCAdvantage More external storage for files using memory cards	vs	Not supported
+155 grams (5.43 ounces)46% Lighter	vs	227 grams (7.95 ounces)
+534 PPI3% Crisper display of text, images and videos because it has more pixels per inch (ppi)	vs	516 PPI
+Li-Ion: lithium-ion (Removable)Advantage Removable battery can be replaced easily	vs	LiPo: li-ion polymer (Non removable)
+3.5mm jackAdvantage Headsets with 3.5mm Jack size are more common and easy to find in stores	vs	Type-C reversible connector
1.8GHz 64bit Hexa-core (20nm)	vs	+2.84GHz 64bit Octa-core (5nm)72% More powerful processor, you can open your applications faster
3GB LPDDR3	vs	+12GB LPDDR53 times More RAM memory. Typically more responsive and better for multitasking.
32GB (25GB available)	vs	+256GB (220GB available)8 times More internal storage for applications and files
eMMC 5.0	vs	+UFS 3.1Advantage Fastest write and read storage.
9.8 millimeters (0.39 inches)	vs	+8.9 millimeters (0.35 inches)10% Thinner
Plastic body, glass front	vs	+Aluminum frame, glass front/backAdvantage More resistant material
TFT IPS LCD	vs	+Dynamic AMOLEDAdvantage Dynamic AMOLED display is brighter and more vivid
Not supported	vs	+HDR10+Advantage The HDR10+ display provides vibrant colors and more details
60Hz	vs	+120Hz100% The display reproduces more frames per second because the frequency (Hertz) is higher, improves fluidity and tires your eyes less.
1440x2560 pixels	vs	+1440x3200 pixels25% Higher resolution screen
5.5"	vs	+6.8"24% Larger screen
(back) 16MP	vs	+(quad camera) 108MP + 10MP + 10MP + 12MP8 times Higher resolution main camera
Only digital zoom	vs	+Digital and optical zoomAdvantage The zoom allows for better focus and approach to take pictures
Not supported	vs	+BSI sensorAdvantage The BSI sensor allows the entry of more light generating photos with more detail and brightness
HDR photo/video only main camera	vs	+HDR photo/video on both camerasAdvantage The HDR technology produced photos with more detail in dark areas
1/2.6" inches	vs	+1/1.33" inches95% The larger sensor camera lets you take photos with better depth.
(front) 8MP	vs	+(front) 40MP4 times Higher resolution secondary camera to take pictures and selfies
4K UHD (3840x2160)	vs	+8K UHD (7680x4320)3 times More image quality for recording videos with the primary camera
(front) Full HD (1920x1080)	vs	+(front) 4K UHD (3840x2160)3 times More image quality for recording videos with the secondary camera
Android 7.0 Nougat	vs	+Android 15Advantage Android 15 is newer and safer
4G LTE-A	vs	+5G Sub6Advantage The 5G Sub6 network is newer and faster
(4G LTE-A) 300 Mbps	vs	+(5G Sub6) 5000 Mbps16 times Faster for surfing the internet and download files
Not supported	vs	+Face unlock 2DAdvantage Sensors help you use the device
Not supported	vs	+Fingerprint sensor (under display)Advantage Sensors help you use the device
Not supported	vs	+UWB (Ultra Wideband)Advantage Sensors help you use the device
3000 mAh	vs	+5000 mAh67% Battery - higher amperage (mAh) allows more device usage time, but it also depends on the hardware and use
18W	vs	+25W39% More power (watts) to charge the battery faster. Sometimes, the charger that comes with the device doesn't have the same power supported by the device. Check before you buy it.
Not supported	vs	+Qi wireless charging (Qi/PMA)Advantage Wireless charging is another way to charge the battery.
2 slots (Dual-SIM) (dedicated slot)	vs	+1 slot (Single-SIM) + e-SIM (Eletronic)Advantage You can have more mobile carriers/operators on the same device.
Mono sound (not stereo)	vs	+Stereo soundAdvantage Better sound quality for listening to music or clearer hands-free calls
802.11 a/b/g/n/ac [wifi5]	vs	+802.11 a/b/g/n/ac/ax [wifi6]Advantage WiFi 802.11 a/b/g/n/ac/ax [wifi6] is newer and faster
4.1 + A2DP	vs	+5.2 + A2DP/LEAdvantage Bluetooth 5.2 + A2DP/LE is newer and faster
MicroUSB 2.0, USB OTG On-The-Go	vs	+USB 3.2 Type-C, USB OTG On-The-GoAdvantage Newer and faster USB version for transferring photos, mp3 or data.
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	+IP68 certifiedAdvantage Protection against water allows you talk to your friends in the rain, for example

23 Common items in both devices

16 million

LED flash

LDAF: laser detection autofocus / PDAF: phase detection autofocus on both cameras

OIS (3-axis): Optical stabilization / OIS: Optical stabilization

f/1.8 (aperture)

Capacitive

Multitouch

+16 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 G4 (Dual H818P)	Galaxy S21 Ultra (SM-G998U1 256GB)
Change model		Choose the model
Model	LG G4 (Dual H818P)	Galaxy S21 Ultra (SM-G998U1 256GB)
Other model names	LG G4 Dual-SIM H818P, LG-H818P, LG P1	Galaxy S21 Ultra 5G (SM-G998U1) Unlocked
Country or region available	South Africa, Brazil, United Arab Emirates, Philippines, Singapore, Thailand	USA
Brand	LG	Samsung
Release date	5/1/2015, Announced: 4/28/2015	1/29/2021, Announced: 1/14/2021
Depth	9.8 millimeters (0.39 inches)	8.9 millimeters (0.35 inches)
Size (width x height)	76.1 x 148.9 millimeters (3 x 5.86 in)	75.6 x 165.1 millimeters (2.98 x 6.5 in)
Weight	155 grams (5.43 ounces)	227 grams (7.95 ounces)
Build, materials	Plastic body, glass front	Aluminum frame, glass front/back
Protection against water and others	Not supported	IP68 certified: water-resistant up to 1.5 meters for 30min and dust-resistant
📲 Display
	LG G4 (Dual H818P)	Galaxy S21 Ultra (SM-G998U1 256GB)
Display type	TFT IPS LCD	Dynamic AMOLED
Screen size	5.5" inches	6.8" inches
Screen-to-body ratio	~73.6% (screen-to-body ratio)	~89.4% (screen-to-body ratio)
Display resolution	1440x2560 pixels (16:9)	1440x3200 pixels (20:9)
Touchscreen	Capacitive Multitouch	Capacitive Multitouch 10-points
Pixel density (dot pitch)	534 PPI	516 PPI
Colors	16 million	16 million
Scratch-resistant glass	Gorilla Glass 3	Gorilla Glass Victus
Refresh rate	60Hz	120Hz
Display features	Not supported	1500nits[peak] HDR10+ Always-On Display
🤖 Operating System
	LG G4 (Dual H818P)	Galaxy S21 Ultra (SM-G998U1 256GB)
System version	Android 5.1 Lollipop	Android 11
Firmware update	Android 7.0 Nougat	Android 15
User Interface	LG UX 4.0 UI	One UI 3.1 / 4.1 / 5.1 / 6.0 / 7.0
⚙️ Processor
	LG G4 (Dual H818P)	Galaxy S21 Ultra (SM-G998U1 256GB)
Chipset	64bit: Qualcomm Snapdragon 808 (MSM8992) (20nm)	64bit: Qualcomm Snapdragon 888 (SM8350) (5nm)
CPU	Hexa-core, 2 processors: 2x 1.8GHz ARM Cortex-A57 (Dual-core) 4x 1.4GHz ARM Cortex-A53 (Quad-core)	Octa-core, 3 processors: 1x 2.84GHz Kryo 680 (Single-core) 3x 2.42GHz Kryo 680 (Triple-core) 4x 1.8GHz Kryo 680 (Quad-core)
GPU graphical controller	Qualcomm Adreno 418 (600MHz)	Qualcomm Adreno 660 (840MHz)
Performance (benchmark)	Basemark OS II: 1584 (v2)	AnTuTu: 681099 (v8), 809165 (v9) Geekbench: 3539 (v5.2) GFXBench: 54fps (ES 3.1 onscreen)
💽 Memory and storage
	LG G4 (Dual H818P)	Galaxy S21 Ultra (SM-G998U1 256GB)
RAM memory	3GB LPDDR3	12GB LPDDR5
Internal storage	32GB (25GB available) eMMC 5.0	256GB (220GB available) UFS 3.1
External storage	Until 128GB microSD, microSDXC (dedicated slot)	Not supported
📶 Mobile networks
	LG G4 (Dual H818P)	Galaxy S21 Ultra (SM-G998U1 256GB)
Dual-SIM	Dual-SIM Standby - Call active on one sim card (dedicated slot)	Dual-SIM Standby - Call active on one sim card
SIM card	2 slots (Dual-SIM) micro-SIM (3FF)	1 slot (Single-SIM) nano-SIM (4FF) + e-SIM
Maximum Download / Upload	300/50 Mbps	5000/1920 Mbps
Network technology	2G, 3G, 4G	2G, 3G, 4G, 5G
Frequency, bands	Expand band details Collapse details
GSM MHz band	Quad-Band 850/900/1800/1900	Quad-Band 850/900/1800/1900
Primary 2G network	GSM 850/900/1800/1900	CDMA 800/1900, GSM 850/900/1800/1900
Primary 3G network	UMTS 850/900/1900/2100	CDMA2000 1xEV-DO UMTS 850/900/1700/1900/2100
Primary 4G network	LTE Cat6 (1, 2, 3, 5, 7, 8, 17)	LTE Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 30, 66, 71) TD-LTE (38, 39, 40, 41, 46, 48) VoLTE
Primary 5G network	Not supported	SA/NSA/Sub6 (2, 5, 25, 41, 66, 71) mmWave (260, 261)
Primary data network	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, LTE, LTE-A	GPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA, Sub6
Secondary 2G network	GSM 850/900/1800/1900	CDMA 800/1900, GSM 850/900/1800/1900
Secondary 3G network	UMTS 850/900/1900/2100	CDMA2000 1xEV-DO UMTS 850/900/1700/1900/2100
Secondary 4G network	LTE Cat6 (1, 2, 3, 5, 7, 8, 17)	LTE Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 30, 66, 71) TD-LTE (38, 39, 40, 41, 46, 48) VoLTE
Secondary data network	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, LTE, LTE-A	GPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA, Sub6
📷 Camera
	LG G4 (Dual H818P)	Galaxy S21 Ultra (SM-G998U1 256GB)
Back camera (main camera)	16 megapixels	(quad camera) 108 megapixels 10MP periscope telephoto f/4.9240mm1/3.24"1.22µmPDAFOIS10x-optical-zoom 10MP telephoto f/2.470mm1/3.24"1.22µmPDAFOIS3x-optical-zoom 12MP ultrawide f/2.213mm1/2.55"1.4µmPDAFSuper-Steady-video
Main camera resolution	5312x2988 pixels	12000x9000 pixels
Video recording (primary)	4K UHD (3840x2160) 30 fps	8K UHD (7680x4320) 24 fps
Flash	LED flash	LED flash
Focal aperture	f/1.8 (aperture)	f/1.8 (aperture)
Focal length	28mm (lens)	26mm (lens)
Sensor size	1/2.6" inches	1/1.33" inches
Pixel size	1.12µm pixel	1.8µm pixel
Autofocus	LDAF: laser detection autofocus	PDAF: phase detection autofocus on both cameras
Touch focus	Supported	Supported
Image stabilization	OIS (3-axis): Optical stabilization	OIS: Optical stabilization
Zoom	Only digital zoom	Digital and optical zoom
Face/smile detection	Face detection, Smile detection	Face detection, Smile detection
BSI sensor	Not supported	Supported
HDR	HDR photo/video only main camera	HDR photo/video on both cameras
Camera extras	4K@30fps 1080p@30fps	4K@60fps 1080p@240fps 720p@960fps
📸 Front camera
	LG G4 (Dual H818P)	Galaxy S21 Ultra (SM-G998U1 256GB)
Front camera (secondary)	8 megapixels	40 megapixels
Front camera resolution	3264x2448 pixels	7296x5472 pixels
Video recording (secondary)	Full HD (1920x1080)	4K UHD (3840x2160)
Front flash	Not supported	Not supported
Focal aperture	f/2.0 (aperture)	f/2.2 (aperture)
Focal length	feature not registered	26mm (lens)
Sensor size	1/4" inches	1/2.8" inches
Pixel size	1.12µm pixel	0.7µm pixel
🔉 Sound and multimedia
	LG G4 (Dual H818P)	Galaxy S21 Ultra (SM-G998U1 256GB)
Loudspeaker	Mono sound (not stereo) 24-bit/192kHz	Stereo sound 32-bit/384kHz Dolby Atmos Tuned by AKG
Active noise cancellation	2 microphones or more	3 microphones
Radio	FM (RDS)	FM
TV	Not supported	Not supported
Video formats	MP4, H.264, H.263, DivX, XviD, WMV	MP4, H.265, H.264, H.263, XviD, MKV
Audio formats	MP3, WAV, WMA, eAAC+, FLAC	MP3, WAV, WMA, eAAC+, FLAC
🔌 Connectivity
	LG G4 (Dual H818P)	Galaxy S21 Ultra (SM-G998U1 256GB)
USB	MicroUSB 2.0, USB OTG On-The-Go	USB 3.2 Type-C, USB OTG On-The-Go
Audio output	3.5mm jack	Type-C reversible connector
TV output	Micro-B USB SlimPort	USB Type-C (reversible)
Bluetooth	4.1 + A2DP	5.2 + A2DP/LE
WiFi	802.11 a/b/g/n/ac [wifi5] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot	802.11 a/b/g/n/ac/ax [wifi6] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot
DLNA	Supported	Supported
GPS	A-GPS, GeoTagging, GLONASS	A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou
NFC	Supported	Supported
Infrared port	Supported	Not supported
🧭 Sensors
	LG G4 (Dual H818P)	Galaxy S21 Ultra (SM-G998U1 256GB)
Sensors	Accelerometer Ambient light sensor Barometer Compass Gyroscope Proximity sensor	Accelerometer Ambient light sensor Barometer Compass Face unlock 2D Fingerprint sensor (under display) Gesture Gyroscope Hall effect Proximity sensor UWB (Ultra Wideband)
Vibrating alert	Supported	Supported
🔋 Battery
	LG G4 (Dual H818P)	Galaxy S21 Ultra (SM-G998U1 256GB)
Battery type	Li-Ion: lithium-ion (Removable)	LiPo: li-ion polymer (Non removable)
Battery capacity	3000 mAh	5000 mAh
Charger, watts	18W Wired fast charging Quick Charge 2	25W Wired fast charging USB Power Delivery 3.0
Inductive / wireless charging	Not supported	15W Qi wireless charging (Qi/PMA) 4.5W Reverse wireless charging
Talk time autonomy	12 hours	feature not registered
Standby	315 hours (13.1 days)	feature not registered
➕ Other features
	LG G4 (Dual H818P)	Galaxy S21 Ultra (SM-G998U1 256GB)
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: Grey, White, Gold, Leather Black, Leather Brown, Leather Red • Knock Code • Quick Remote	• Colors: Phantom Black, Silver, Titanium, Navy, Brown • Samsung Pay (Visa, MasterCard) • Samsung DeX • Stylus pen support
☢️ Radiation rate
	LG G4 (Dual H818P)	Galaxy S21 Ultra (SM-G998U1 256GB)
SAR 1.6W/kg (USA, Mexico, etc.)	feature not registered	0.77W/kg (head), 1.02W/kg (body)
SAR 2W/kg (Europe, UK, etc.)	0.62W/kg (head)	feature not registered