LG K51 (K500QM5) vs Samsung Galaxy S21 Ultra (SM-G998B 256GB)
Side by side comparison between LG K51 vs Samsung Galaxy S21 Ultra phones, differences, pros, cons and full specifications. What's the better?
,
6.5"
IPS
IPS
720x1560
13
MP
MP
13mp
3GB
RAM
RAM
Octa-core
4000
mAh
mAh
(Non removable)
vs
6.8"
AMOLED
AMOLED
1440x3200
108
MP
MP
40mp
12GB
RAM
RAM
Octa-core
5000
mAh
mAh
(Non removable)
What's the better phone? Samsung Galaxy S21 Ultra (SM-G998B 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!
17 Common items in both devices |
16 million |
LED flash |
PDAF: phase detection autofocus / PDAF: phase detection autofocus on both cameras |
HDR photo on both cameras / HDR photo/video on both cameras |
f/1.8 (aperture) |
Capacitive |
Multitouch |
+10 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 Clear highlight📱 Model features | ||
LG K51 (K500QM5) | Galaxy S21 Ultra (SM-G998B 256GB) | |
Model | K51 (K500QM5) | Galaxy S21 Ultra (SM-G998B 256GB) |
Other model names | LG K51 (Xfinity Mobile) LMK500QM5ACSTTN, LM-K500QM5 | Galaxy S21 Ultra 5G (SM-G998B Single-SIM) |
Country or region available | USA | Australia |
Brand | LG | Samsung |
Release date | 4/2/2020 | 1/29/2021, Announced: 1/14/2021 |
Depth | 8.47 millimeters (0.33 inches) | 8.9 millimeters (0.35 inches) |
Size (width x height) | 77.92 x 166.96 millimeters (3.07 x 6.57 in) | 75.6 x 165.1 millimeters (2.98 x 6.5 in) |
Weight | 204 grams (7.14 ounces) | 227 grams (7.95 ounces) |
Build, materials | Plastic body, glass front | Aluminum frame, glass front/back |
Protection against water and others | MIL-STD-810G military certified: salt, dust, humidity, rain, vibration, solar radiation, transport and thermal shock resistant. | IP68 certified: water-resistant up to 1.5 meters for 30min and dust-resistant |
📲 Display | ||
LG K51 (K500QM5) | Galaxy S21 Ultra (SM-G998B 256GB) | |
Display type | TFT IPS LCD | Dynamic AMOLED |
Screen size | 6.5" inches | 6.8" inches |
Screen-to-body ratio | ~79.7% (screen-to-body ratio) | ~89.4% (screen-to-body ratio) |
Display resolution | 720x1560 pixels (19.5:9) | 1440x3200 pixels (20:9) |
Touchscreen | Capacitive Multitouch | Capacitive Multitouch 10-points |
Pixel density (dot pitch) | 264 PPI | 516 PPI |
Colors | 16 million | 16 million |
Scratch-resistant glass | Panda King Glass | Gorilla Glass Victus |
Refresh rate | 60Hz | 120Hz |
Display features | Not supported | 1500nits[peak] HDR10+ Always-On Display |
🤖 Operating System | ||
LG K51 (K500QM5) | Galaxy S21 Ultra (SM-G998B 256GB) | |
System version | Android 10 | Android 11 |
Firmware update | feature not registered | Android 14 |
User Interface | feature not registered | One UI 3.1 / 4.1 / 5.1 / 6.0 |
⚙️ Processor | ||
LG K51 (K500QM5) | Galaxy S21 Ultra (SM-G998B 256GB) | |
Chipset | 64bit: MediaTek Helio P22 (MT6762) (12nm) | 64bit: Samsung Exynos 2100 (5nm) |
CPU | Octa-core, 2 processors: 4x 2GHz ARM Cortex-A53 (Quad-core) 4x 1.5GHz ARM Cortex-A53 (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 | PowerVR GE8320 (650MHz) | 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 K51 (K500QM5) | Galaxy S21 Ultra (SM-G998B 256GB) | |
RAM memory | 3GB LPDDR3 | 12GB LPDDR5 |
Internal storage | 32GB (16GB available) eMMC 5.1 | 256GB (220GB available) UFS 3.1 |
External storage | Until 1TB microSD, microSDXC (dedicated slot) | Not supported |
📶 Mobile networks | ||
LG K51 (K500QM5) | Galaxy S21 Ultra (SM-G998B 256GB) | |
Dual-SIM | Not supported | Dual-SIM Standby - Call active on one sim card |
SIM card | 1 slot (Single-SIM) nano-SIM (4FF) | 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 | CDMA 800/1900, GSM 850/900/1800/1900 | GSM 850/900/1800/1900 |
Primary 3G network | CDMA2000 1xEV-DO UMTS 850/900/1700/1900/2100 | UMTS 850/900/1700/1900/2100 |
Primary 4G network | LTE Cat6 (2, 3, 4, 5, 7, 12, 13, 20, 66) | 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, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, UMTS, HSDPA, HSUPA, HSPA+, LTE, LTE-A | 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 K51 (K500QM5) | Galaxy S21 Ultra (SM-G998B 256GB) | |
Back camera (main camera) | (triple camera) 13 megapixels 5MP ultrawide f/2.21.12μm1/5"115° 2MP depth f/2.41.75μm1/5"85° | (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 | 4128x3096 pixels | 12000x9000 pixels |
Video recording (primary) | Full HD (1920x1080) 30 fps | 8K UHD (7680x4320) 24 fps |
Flash | LED flash | LED flash |
Focal aperture | f/1.8 (aperture) | f/1.8 (aperture) |
Focal length | 26mm lens | 26mm lens |
Sensor size | 1/3" inches | 1/1.33" inches |
Pixel size | 1.12µm pixel | 1.8µm pixel |
Autofocus | PDAF: phase detection autofocus | PDAF: phase detection autofocus on both cameras |
Touch focus | Supported | Supported |
Image stabilization | EIS: Digital 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 on both cameras | HDR photo/video on both cameras |
Camera extras | feature not registered | 4K@60fps 1080p@240fps 720p@960fps |
📸 Front camera | ||
LG K51 (K500QM5) | Galaxy S21 Ultra (SM-G998B 256GB) | |
Front camera (secondary) | 13 megapixels | 40 megapixels |
Front camera resolution | 4128x3096 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 | 1/3" inches | 1/2.8" inches |
Pixel size | 1.12µm pixel | 0.7µm pixel |
🔉 Sound and multimedia | ||
LG K51 (K500QM5) | Galaxy S21 Ultra (SM-G998B 256GB) | |
Loudspeaker | Supported | Stereo sound 32-bit/384kHz Dolby Atmos Tuned by AKG |
Active noise cancellation | 2 microphones or more | 2 microphones or more |
Radio | Not supported | FM |
TV | Not supported | Not supported |
Video formats | MP4, H.265, 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 K51 (K500QM5) | Galaxy S21 Ultra (SM-G998B 256GB) | |
USB | USB 2.0 Type-C, 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 | Not supported | USB Type-C (reversible) |
Bluetooth | 5.0 + A2DP/LE | 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 | Not supported | Supported |
GPS | A-GPS, GeoTagging, GLONASS | A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou |
NFC | Not supported | Supported |
Infrared port | Not supported | Not supported |
🧭 Sensors | ||
LG K51 (K500QM5) | Galaxy S21 Ultra (SM-G998B 256GB) | |
Sensors | Accelerometer Ambient light sensor Compass Fingerprint sensor (rear-mounted) Gyroscope Proximity sensor | Accelerometer Ambient light sensor Barometer Compass Face unlock Fingerprint sensor (under display) Gesture Gyroscope Hall effect Proximity sensor UWB (Ultra Wideband) |
Vibrating alert | Supported | Supported |
🔋 Battery | ||
LG K51 (K500QM5) | Galaxy S21 Ultra (SM-G998B 256GB) | |
Battery type | LiPo: li-ion polymer (Non removable) | LiPo: li-ion polymer (Non removable) |
Battery capacity | 4000 mAh | 5000 mAh |
Charger, watts | 10W (5V/2A) Wired charging | 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 | 21 hours | feature not registered |
Standby | 576 hours (24 days) | feature not registered |
➕ Other features | ||
LG K51 (K500QM5) | Galaxy S21 Ultra (SM-G998B 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: Titan gray • Google Assistant • DTS:X 3D sound surround • HAC M3/T3 | • Colors: Phantom Black, Silver, Titanium, Navy, Brown • Samsung Pay (Visa, MasterCard) • Samsung DeX • Stylus pen support |
☢️ Radiation rate | ||
LG K51 (K500QM5) | Galaxy S21 Ultra (SM-G998B 256GB) | |
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) |