LG G3 (D855 16GB) vs Samsung Galaxy S21 Ultra (SM-G998B 512GB)

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Side by side comparison between LG G3 vs Samsung Galaxy S21 Ultra phones, differences, pros, cons and full specifications. What's the better?

11/14/2021 4:13 PM, updated: 5/19/2025 11:26 AM

Compare Samsung Galaxy S21 Ultra X LG G3 (D855 16GB) 05Points

Specifications Compare Models Pictures

5.5"
IPS+

1440x2392

13
MP

2.1mp

2GB
RAM

Quad-core

3000
mAh

(Removable)

29Points Samsung Galaxy S21 Ultra (SM-G998B 512GB) Compare LG G3 X

Specifications Compare Models Pictures

6.8"
AMOLED

1440x3200

108
MP

40mp

16GB
RAM

Octa-core

5000
mAh

(Non removable)

What's the better phone? Samsung Galaxy S21 Ultra (SM-G998B 512GB)

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 G3 (D855 16GB)	vs	29 Advantages Samsung Galaxy S21 Ultra (SM-G998B 512GB)
+Until 128GB microSD, microSDXCAdvantage More external storage for files using memory cards	vs	Not supported
+149 grams (5.22 ounces)52% Lighter	vs	227 grams (7.95 ounces)
+Dual-LED flashAdvantage The Dual-LED flash helps in dark places or in low light	vs	LED flash
+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
2.5GHz 32bit Quad-core	vs	+2.9GHz 64bit Octa-core (5nm)48% More powerful processor, you can open your applications faster
2GB LPDDR3	vs	+16GB LPDDR57 times More RAM memory. Typically more responsive and better for multitasking.
16GB (10GB available)	vs	+512GB (457GB available)45 times More internal storage for applications and files
TFT Super IPS+	vs	+Dynamic AMOLEDAdvantage Dynamic AMOLED display is brighter and more vivid
1440x2392 pixels	vs	+1440x3200 pixels34% Higher resolution screen
508 PPI	vs	+516 PPI2% Crisper display of text, images and videos because it has more pixels per inch (ppi)
5.5"	vs	+6.8"24% Larger screen
(back) 13MP	vs	+(quad camera) 108MP + 10MP + 10MP + 12MP10 times Higher resolution main camera
Only digital zoom	vs	+Digital and optical zoomAdvantage The zoom allows for better focus and approach to take pictures
HDR photo/video only main camera	vs	+HDR photo/video on both camerasAdvantage The HDR technology produced photos with more detail in dark areas
1/3" inches	vs	+1/1.33" inches126% The larger sensor camera lets you take photos with better depth.
f/2.4 (aperture)	vs	+f/1.8 (aperture)33% Diaphragm opening (Aperture) of the camera which has the smallest F number takes photos with better light exposure.
(front) 2.1MP	vs	+(front) 40MP18 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 5.0 Lollipop	vs	+Android 15Advantage Android 15 is newer and safer
4G LTE	vs	+5G SA/NSAAdvantage The 5G SA/NSA network is newer and faster
(4G LTE) 150 Mbps	vs	+(5G SA/NSA) 5000 Mbps32 times Faster for surfing the internet and download files
Not supported	vs	+BarometerAdvantage Sensors help you use the device
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
1 slot (Single-SIM) (dedicated slot)	vs	+1 slot (Single-SIM) + e-SIM (Eletronic)Advantage You can have more mobile carriers/operators on the same device.
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
4.0 + A2DP	vs	+5.2 + A2DP/LEAdvantage Bluetooth 5.2 + A2DP/LE is newer and faster
MicroUSB 2.0	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	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

22 Common items in both devices

8.9 millimeters (0.35 inches)

16 million

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

OIS: Optical stabilization

BSI sensor

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 G3 (D855 16GB)	Galaxy S21 Ultra (SM-G998B 512GB)
Change model		Choose the model
Model	LG G3 (D855 16GB)	Galaxy S21 Ultra (SM-G998B 512GB)
Other model names	LG G3 4G LTE D855 for Europe, LG Optimus G3, LG B2	Galaxy S21 Ultra 5G (SM-G998B Single-SIM)
Country or region available	(Europe), (Global, International), South Africa, Australia, Brazil, Philippines, Hong Kong, India, Panama, Sri Lanka	Australia
Brand	LG	Samsung
Release date	6/1/2014	1/29/2021, Announced: 1/14/2021
Depth	8.9 millimeters (0.35 inches)	8.9 millimeters (0.35 inches)
Size (width x height)	74.6 x 146.3 millimeters (2.94 x 5.76 in)	75.6 x 165.1 millimeters (2.98 x 6.5 in)
Weight	149 grams (5.22 ounces)	227 grams (7.95 ounces)
Build, materials	feature not registered	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 G3 (D855 16GB)	Galaxy S21 Ultra (SM-G998B 512GB)
Display type	TFT Super IPS+	Dynamic AMOLED
Screen size	5.5" inches	6.8" inches
Screen-to-body ratio	~79% (screen-to-body ratio)	~89.4% (screen-to-body ratio)
Display resolution	1440x2392 pixels	1440x3200 pixels (20:9)
Touchscreen	Capacitive Multitouch 10-points	Capacitive Multitouch 10-points
Pixel density (dot pitch)	508 PPI	516 PPI
Colors	16 million	16 million
Scratch-resistant glass	Gorilla Glass 3	Gorilla Glass Victus
Refresh rate	feature not registered	120Hz
Display features	feature not registered	1500nits[peak] HDR10+ Always-On Display
🤖 Operating System
	LG G3 (D855 16GB)	Galaxy S21 Ultra (SM-G998B 512GB)
System version	Android 4.4.2 KitKat	Android 11
Firmware update	Android 5.0 Lollipop	Android 15
User Interface	feature not registered	One UI 3.1 / 4.1 / 5.1 / 6.0 / 7.0
⚙️ Processor
	LG G3 (D855 16GB)	Galaxy S21 Ultra (SM-G998B 512GB)
Chipset	32bit: Qualcomm Snapdragon 801 MSM8974-AC (28nm)	64bit: Samsung Exynos 2100 (5nm)
CPU	Quad-core, 1 processor: 4x 2.5GHz Krait 400 (Quad-core)	Octa-core, 3 processors: 1x 2.9GHz ARM Cortex-X1 (Single-core) 3x 2.8GHz ARM Cortex-A78 (Triple-core) 4x 2.2GHz ARM Cortex-A55 (Quad-core)
GPU graphical controller	Qualcomm Adreno 330 578Mhz	ARM Mali-G78 MP14 (854MHz)
Performance (benchmark)	feature not registered	AnTuTu: 657150 (v8), 727634 (v9) Geekbench: 3457 (v5.2) GFXBench: 51fps (ES 3.1 onscreen)
💽 Memory and storage
	LG G3 (D855 16GB)	Galaxy S21 Ultra (SM-G998B 512GB)
RAM memory	2GB LPDDR3	16GB LPDDR5
Internal storage	16GB (10GB available)	512GB (457GB available) UFS 3.1
External storage	Until 128GB microSD, microSDXC (dedicated slot)	Not supported
📶 Mobile networks
	LG G3 (D855 16GB)	Galaxy S21 Ultra (SM-G998B 512GB)
Dual-SIM	Not supported	Dual-SIM Standby - Call active on one sim card
SIM card	1 slot (Single-SIM) micro-SIM (3FF)	1 slot (Single-SIM) nano-SIM (4FF) + e-SIM
Maximum Download / Upload	150/50 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	GSM 850/900/1800/1900
Primary 3G network	UMTS 850/900/1900/2100	UMTS 850/900/1700/1900/2100
Primary 4G network	LTE Cat4 800/900/1800/2100/2600	LTE Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 66) TD-LTE (38, 39, 40, 41) VoLTE
Primary 5G network	Not supported	SA/NSA/Sub6 (1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 77, 78)
Primary data network	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, LTE	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA
Secondary 2G network	Not supported	GSM 850/900/1800/1900
Secondary 3G network	Not supported	UMTS 850/900/1700/1900/2100
Secondary 4G network	Not supported	LTE Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 66) TD-LTE (38, 39, 40, 41) VoLTE
Secondary data network	Not supported	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA
📷 Camera
	LG G3 (D855 16GB)	Galaxy S21 Ultra (SM-G998B 512GB)
Back camera (main camera)	13 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	4160x3120 pixels	12000x9000 pixels
Video recording (primary)	4K UHD (3840x2160) 30 fps	8K UHD (7680x4320) 24 fps
Flash	Dual-LED flash	LED flash
Focal aperture	f/2.4 (aperture)	f/1.8 (aperture)
Focal length	29mm (lens)	26mm (lens)
Sensor size	1/3" inches	1/1.33" inches
Pixel size	1.12µm pixel	1.8µm pixel
Autofocus	LDAF/PDAF: laser/phase detection autofocus	PDAF: phase detection autofocus on both cameras
Touch focus	Supported	Supported
Image stabilization	OIS: 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	Supported	Supported
HDR	HDR photo/video only main camera	HDR photo/video on both cameras
Camera extras	feature not registered	4K@60fps 1080p@240fps 720p@960fps
📸 Front camera
	LG G3 (D855 16GB)	Galaxy S21 Ultra (SM-G998B 512GB)
Front camera (secondary)	2.1 megapixels	40 megapixels
Front camera resolution	1920x1080 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	feature not registered	1/2.8" inches
Pixel size	feature not registered	0.7µm pixel
🔉 Sound and multimedia
	LG G3 (D855 16GB)	Galaxy S21 Ultra (SM-G998B 512GB)
Loudspeaker	Supported	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 G3 (D855 16GB)	Galaxy S21 Ultra (SM-G998B 512GB)
USB	MicroUSB 2.0	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	4.0 + 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 G3 (D855 16GB)	Galaxy S21 Ultra (SM-G998B 512GB)
Sensors	Accelerometer Ambient light sensor 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 G3 (D855 16GB)	Galaxy S21 Ultra (SM-G998B 512GB)
Battery type	Li-Ion: lithium-ion (Removable) BL-53YH	LiPo: li-ion polymer (Non removable)
Battery capacity	3000 mAh	5000 mAh
Charger, watts	Wired charging	25W Wired fast charging USB Power Delivery 3.0
Inductive / wireless charging	feature not registered	15W Qi wireless charging (Qi/PMA) 4.5W Reverse wireless charging
Talk time autonomy	20 hours	feature not registered
Standby	500 hours (20.8 days)	feature not registered
➕ Other features
	LG G3 (D855 16GB)	Galaxy S21 Ultra (SM-G998B 512GB)
Call control	Voice dialing, Voice recorder, Voice commands	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, White, Gold, Violet, Red • USB OTG On-The-Go 1.3 • Notification LED • Dolby mobile sound • 1W Speaker with Boost AMP • Knock Code, Quick Memo, QRemote • Plastic body • MiraCast • Wireless Charging	• Colors: Phantom Black, Silver, Titanium, Navy, Brown • Samsung Pay (Visa, MasterCard) • Samsung DeX • Stylus pen support
☢️ Radiation rate
	LG G3 (D855 16GB)	Galaxy S21 Ultra (SM-G998B 512GB)
SAR 1.6W/kg (USA, Mexico, etc.)	feature not registered	0.24W/kg (head), 0.72W/kg (body)
SAR 2W/kg (Europe, UK, etc.)	feature not registered	0.714W/kg (head), 1.58W/kg (body)