LG X400 (K121S) vs Xiaomi Mi 8 Pro (128GB/6GB)
Side by side comparison between LG X400 vs Xiaomi Mi 8 Pro phones, differences, pros, cons and full specifications. What's the better?
,
5.3"
IPS
IPS
720x1280
13
MP
MP
5mp
2GB
RAM
RAM
Octa-core
2800
mAh
mAh
(Removable)
vs
6.21"
AMOLED
AMOLED
1080x2248
12
MP
MP
20mp
6GB
RAM
RAM
Octa-core
3000
mAh
mAh
(Non removable)
What's the better phone? Xiaomi Mi 8 Pro (128GB/6GB)
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 
30 Advantages | 15 Common items in both devices |
| 16 million |
| Autofocus / PDAF: phase detection autofocus |
| (front) Full HD (1920x1080) |
| 4G LTE-A |
| Capacitive |
| Multitouch |
| Accelerometer |
| +8 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 X400 (K121S) | Xiaomi Mi 8 Pro (128GB/6GB) | |
| Model | X400 (K121S) | Xiaomi Mi 8 Pro (128GB/6GB) |
| Other model names | SKT LG X400, LGM-K121S, LGMK121S (SK Telecom) | 小米8 Pro, Xiaomi 8 Pro (6GB RAM) M1807E8A, Xiaomi Ursa |
| Country or region available |  South Korea |  (Global, International) |
| Brand | LG | Xiaomi |
| Release date | 2/1/2017 | 9/1/2018 |
| Depth | 8 millimeters (0.31 inches) | 7.6 millimeters (0.3 inches) |
| Size (width x height) | 75.29 x 148.7 millimeters (2.96 x 5.85 in) | 74.8 x 154.9 millimeters (2.94 x 6.1 in) |
| Weight | 142 grams (4.97 ounces) | 177 grams (6.2 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) | Xiaomi Mi 8 Pro (128GB/6GB) | |
| Display type | TFT IPS LCD | Super AMOLED |
| Screen size | 5.3" inches | 6.21" inches |
| Screen-to-body ratio | ~69.2% (screen-to-body ratio) | ~83.8% (screen-to-body ratio) |
| Display resolution | 720x1280 pixels | 1080x2248 pixels |
| Touchscreen | Capacitive Multitouch | Capacitive Multitouch |
| Pixel density (dot pitch) | 277 PPI | 402 PPI |
| Colors | 16 million | 16 million |
| Scratch-resistant glass | Not supported | Gorilla Glass 5 |
| Refresh rate | feature not registered | feature not registered |
| Display features | feature not registered | feature not registered |
🤖 Operating System | ||
| LG X400 (K121S) | Xiaomi Mi 8 Pro (128GB/6GB) | |
| System version | Android 7.0 Nougat | Android 8.1 Oreo |
| Firmware update | Android 8.0 Oreo | Android 9.0 Pie |
| User Interface | feature not registered | feature not registered |
⚙️ Processor | ||
| LG X400 (K121S) | Xiaomi Mi 8 Pro (128GB/6GB) | |
| Chipset | 64bit: MediaTek MT6750 (28nm) | 64bit: Qualcomm Snapdragon 845 MSM8998 (10nm) |
| CPU | Octa-core, 2 processors: 4x 1.5GHz ARM Cortex-A53 (Quad-core) 4x 1GHz ARM Cortex-A53 (Quad-core) | Octa-core, 2 processors: 4x 2.8GHz Kryo 385 Gold (Quad-core) 4x 1.8GHz Kryo 385 Silver (Quad-core) |
| GPU graphical controller | ARM Mali-T860 MP2 520Mhz | Qualcomm Adreno 630 710Mhz |
| Performance (benchmark) | feature not registered | feature not registered |
💽 Memory and storage | ||
| LG X400 (K121S) | Xiaomi Mi 8 Pro (128GB/6GB) | |
| RAM memory | 2GB LPDDR3 | 6GB LPDDR4X |
| Internal storage | 32GB (22GB available) | 128GB (110GB available) UFS 2.1 |
| External storage | Until 256GB microSD, microSDXC (dedicated slot) | Not supported |
📶 Mobile networks | ||
| LG X400 (K121S) | Xiaomi Mi 8 Pro (128GB/6GB) | |
| 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 | 1024/150 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 | GSM 850/900/1800/1900 |
| Primary 3G network | UMTS 2100 | UMTS 850/900/1700/1900/2100 |
| Primary 4G network | LTE Cat6 850/900/1800/2100/2600 (Bands 1,3,5,7,8) VoLTE | LTE Cat16 (Bands 1,2,3,4,5,7,8,12,17,20) 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, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A |
| 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) | Xiaomi Mi 8 Pro (128GB/6GB) | |
| Back camera (main camera) | 13 megapixels | (dual camera) 12 megapixels 12MP telephoto f/2.41/3.4"1.0µmAF2x-optical-zoom |
| Main camera resolution | 4160x3120 pixels | 4000x3000 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 | feature not registered |
| Sensor size | 1/3" inches | 1/2.55" inches |
| Pixel size | 1.12µm pixel | 1.4µm pixel |
| Autofocus | Autofocus | PDAF: phase detection autofocus |
| Touch focus | Supported | Supported |
| Image stabilization | EIS: Digital stabilization | OIS (4-axis): 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 | 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) | Xiaomi Mi 8 Pro (128GB/6GB) | |
| Front camera (secondary) | 5 megapixels | 20 megapixels |
| Front camera resolution | 2560x1920 pixels | 5184x3840 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 | 0.9µm pixel |
🔉 Sound and multimedia | ||
| LG X400 (K121S) | Xiaomi Mi 8 Pro (128GB/6GB) | |
| Loudspeaker | Supported | Supported |
| Active noise cancellation | 2 microphones or more | 2 microphones or more |
| Radio | FM (RDS) | Not supported |
| TV | Digital TV | Not supported |
| Video formats | MP4, H.264, H.263, XviD, MKV | MP4, H.265, H.264, H.263, DivX, XviD, WMV |
| Audio formats | MP3, WAV, WMA, eAAC+, FLAC | MP3, WAV, WMA, eAAC+, FLAC |
🔌 Connectivity | ||
| LG X400 (K121S) | Xiaomi Mi 8 Pro (128GB/6GB) | |
| USB | MicroUSB 2.0, USB OTG On-The-Go | USB 2.0 Type-C, USB OTG On-The-Go |
| Audio output | 3.5mm jack | Type-C jack with 3.5mm jack adapter |
| 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 | Supported |
| GPS | A-GPS, GeoTagging, GLONASS | A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou, QZSS |
| NFC | Supported | Supported |
| Infrared port | Not supported | Not supported |
🧭 Sensors | ||
| LG X400 (K121S) | Xiaomi Mi 8 Pro (128GB/6GB) | |
| Sensors | Accelerometer Ambient light sensor Compass Fingerprint sensor (rear-mounted) Proximity sensor | Accelerometer Ambient light sensor Barometer Compass Face unlock Fingerprint sensor (under display) Gyroscope Hall effect Proximity sensor |
| Vibrating alert | Supported | Supported |
🔋 Battery | ||
| LG X400 (K121S) | Xiaomi Mi 8 Pro (128GB/6GB) | |
| Battery type | Li-Ion: lithium-ion (Removable) | LiPo: li-ion polymer (Non removable) |
| Battery capacity | 2800 mAh | 3000 mAh |
| Charger, watts | Wired charging | 18W Wired fast charging |
| Inductive / wireless charging | feature not registered | feature not registered |
| Talk time autonomy | 9 hours | feature not registered |
| Standby | 390 hours (16.3 days) | feature not registered |
➕ Other features | ||
| LG X400 (K121S) | Xiaomi Mi 8 Pro (128GB/6GB) | |
| 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: Black (transparent back), Meteorite black, Twilight Gold • MIUI 10 • 600nit / DCI-P3 / HDR10 display • Always-On Display • Quick Charge 4.0+ • WiFi display |
☢️ Radiation rate | ||
| LG X400 (K121S) | Xiaomi Mi 8 Pro (128GB/6GB) | |
| 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 |