LG X400 (K121S) All specs
Full specifications phone: LG X400 (K121S) specs, detailed technical information, features, price and review. All about this phone.
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The LG X400 (K121S) is a good Android phone with 1.5GHz Octa-core processor that allows run games and heavy applications.
With one SIM card slot, the LG X400 (K121S) allows download up to 300 Mbps for internet browsing, but it also depends on the carrier.
Great connectivity of this device includes Bluetooth 4.2 + A2DP, WiFi 802.11 b/g/n [wifi4] (2.4GHz) and NFC to make mobile payments or connection to other devices.
Including the battery, the LG X400 (K121S) phone has 142 grams and it's a very thin device, only 8mm.
Summary
⚙️ CPU: MediaTek MT6750 (28nm)
🤖 Android 7.0
🔄 Android 8.0
🔄 Android 8.0
📱 5.3"
TFT IPS LCD
TFT IPS LCD
🔳 RAM: 2GB
💽 ROM: 32GB
💽 ROM: 32GB
🔌 WIFI4, BT4.2, FM, NFC
📷 (back) 13MP
🤳 (front) 5MP
🤳 (front) 5MP
🔋 2800mAh
📱 Model features | |
| LG X400 (K121S) | |
| Model | X400 (K121S) |
| Other model names | SKT LG X400, LGM-K121S, LGMK121S (SK Telecom) |
| Country or region available |  South Korea |
| Brand | LG |
| Release date | 2/1/2017 |
| Depth | 8 millimeters (0.31 inches) |
| Size (width x height) | 75.29 x 148.7 millimeters (2.96 x 5.85 in) |
| Weight | 142 grams (4.97 ounces) |
| Build, materials | Plastic body, glass front |
| Protection against water and others | Not supported |
📲 Display | |
| LG X400 (K121S) | |
| Display type | TFT IPS LCD |
| Screen size | 5.3" inches |
| Screen-to-body ratio | ~69.2% (screen-to-body ratio) |
| Display resolution | 720x1280 pixels |
| Touchscreen | Capacitive Multitouch |
| Pixel density (dot pitch) | 277 PPI |
| Colors | 16 million |
| Scratch-resistant glass | Not supported |
| Refresh rate | feature not registered |
| Display features | feature not registered |
🤖 Operating System | |
| LG X400 (K121S) | |
| System version | Android 7.0 Nougat |
| Firmware update | Android 8.0 Oreo |
| User Interface | feature not registered |
⚙️ Processor | |
| LG X400 (K121S) | |
| Chipset | 64bit: MediaTek MT6750 (28nm) |
| CPU | Octa-core, 2 processors: 4x 1.5GHz ARM Cortex-A53 (Quad-core) 4x 1GHz ARM Cortex-A53 (Quad-core) |
| GPU graphical controller | ARM Mali-T860 MP2 520Mhz |
| Performance (benchmark) | feature not registered |
💽 Memory and storage | |
| LG X400 (K121S) | |
| RAM memory | 2GB LPDDR3 |
| Internal storage | 32GB (22GB available) |
| External storage | Until 256GB microSD, microSDXC (dedicated slot) |
📶 Mobile networks | |
| LG X400 (K121S) | |
| Dual-SIM | Not supported |
| SIM card | 1 slot (Single-SIM) nano-SIM (4FF) |
| Maximum Download / Upload | 300/50 Mbps |
| Network technology | 2G, 3G, 4G |
| Frequency, bands | Expand band details Collapse details |
| GSM MHz band | Tri-Band 900/1800/1900 |
| Primary 2G network | GSM 900/1800/1900 |
| Primary 3G network | UMTS 2100 |
| Primary 4G network | LTE Cat6 850/900/1800/2100/2600 (Bands 1,3,5,7,8) VoLTE |
| Primary 5G network | Not supported |
| Primary data network | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, LTE, LTE-A |
| Secondary 2G network | Not supported |
| Secondary 3G network | Not supported |
| Secondary 4G network | Not supported |
| Secondary data network | Not supported |
📷 Camera | |
| LG X400 (K121S) | |
| Back camera (main camera) | 13 megapixels |
| Main camera resolution | 4160x3120 pixels |
| Video recording (primary) | Full HD (1920x1080) 30 fps |
| Flash | LED flash |
| Focal aperture | f/2.2 (aperture) |
| Focal length | feature not registered |
| Sensor size | 1/3" inches |
| Pixel size | 1.12µm pixel |
| Autofocus | Autofocus |
| Touch focus | Supported |
| Image stabilization | EIS: Digital stabilization |
| Zoom | Only digital zoom |
| Face/smile detection | Face detection, Smile detection |
| BSI sensor | Not supported |
| HDR | HDR photo only main camera |
| Camera extras | feature not registered |
📸 Front camera | |
| LG X400 (K121S) | |
| Front camera (secondary) | 5 megapixels |
| Front camera resolution | 2560x1920 pixels |
| Video recording (secondary) | Full HD (1920x1080) |
| Front flash | Not supported |
| Focal aperture | f/2.4 (aperture) |
| Focal length | feature not registered |
| Sensor size | 1/5" inches |
| Pixel size | 1.12µm pixel |
🔉 Sound and multimedia | |
| LG X400 (K121S) | |
| Loudspeaker | Supported |
| Active noise cancellation | 2 microphones or more |
| Radio | FM (RDS) |
| TV | Digital TV |
| Video formats | MP4, H.264, H.263, XviD, MKV |
| Audio formats | MP3, WAV, WMA, eAAC+, FLAC |
🔌 Connectivity | |
| LG X400 (K121S) | |
| USB | MicroUSB 2.0, USB OTG On-The-Go |
| Audio output | 3.5mm jack |
| TV output | Not supported |
| Bluetooth | 4.2 + A2DP |
| WiFi | 802.11 b/g/n [wifi4] (2.4GHz) WiFi Direct, hotspot |
| DLNA | Not supported |
| GPS | A-GPS, GeoTagging, GLONASS |
| NFC | Supported |
| Infrared port | Not supported |
🧭 Sensors | |
| LG X400 (K121S) | |
| Sensors | Accelerometer Ambient light sensor Compass Fingerprint sensor (rear-mounted) Proximity sensor |
| Vibrating alert | Supported |
🔋 Battery | |
| LG X400 (K121S) | |
| Battery type | Li-Ion: lithium-ion (Removable) |
| Battery capacity | 2800 mAh |
| Charger, watts | Wired charging |
| Inductive / wireless charging | feature not registered |
| Talk time autonomy | 9 hours |
| Standby | 390 hours (16.3 days) |
➕ Other features | |
| LG X400 (K121S) | |
| Call control | Voice dialing, Voice recorder |
| Messaging | SMS (T9), MMS, E-mail, Push mail |
| Hands-free calling | Supported |
| Video calling | Supported |
| Ringtones | Polyphonic and customized |
| Web browser | HTML, XHTML, HTML5 |
| Antenna | Internal antenna |
| Qwerty physical keyboard | 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) |
☢️ Radiation rate | |
| LG X400 (K121S) | |
| SAR 1.6W/kg (USA, Mexico, etc.) | feature not registered |
| SAR 2W/kg (Europe, UK, etc.) | feature not registered |
LG X400 versions (variations) with different specifications
LG X400 (K121K)LG X400 (K121L)LG X400 (K121S) LG X400 (K121S) vs 
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