LG X400 (K121K) vs Fairphone 6
Side by side comparison between LG X400 vs Fairphone 6 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
6.31"
OLED
OLED
1116x2484
50
MP
MP
32mp
8GB
RAM
RAM
Octa-core
4415
mAh
mAh
(Removable)
What's the better phone? Fairphone 6
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 
33 Advantages | 18 Common items in both devices |
| Only digital zoom |
| Autofocus / PDAF on back camera and autofocus front camera |
| Capacitive |
| Multitouch |
| Accelerometer |
| Ambient light sensor |
| Compass |
| +11 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 (K121K) | Fairphone 6 | |
| Model | X400 (K121K) | Fairphone 6 |
| Other model names | KT LG X400, LGM-K121K, LGMK121K (Korea Telecom) | Fairphone (Gen. 6) |
| Country or region available |  South Korea |   (Europe), (Global, International) |
| Brand | LG | Fairphone |
| Release date | 2/1/2017 | 6/25/2025 |
| Depth | 8 millimeters (0.31 inches) | 9.6 millimeters (0.38 inches) |
| Size (width x height) | 75.29 x 148.7 millimeters (2.96 x 5.85 in) | 73.3 x 156.5 millimeters (2.89 x 6.16 in) |
| Weight | 142 grams (4.97 ounces) | 193 grams (6.76 ounces) |
| Build, materials | Plastic body, glass front | Aluminum body, glass front, plastic back |
| Protection against water and others | Not supported | IP55 certified: dust resistant and protection from short-term exposure to water jets MIL-STD-810H military certified: rigorous testing for salt, dust, humidity, rain, vibration, solar radiation, drop and thermal shock resistance. |
📲 Display | ||
| LG X400 (K121K) | Fairphone 6 | |
| Display type | TFT IPS LCD | LTPO OLED |
| Screen size | 5.3" inches | 6.31" inches |
| Screen-to-body ratio | ~69.2% (screen-to-body ratio) | ~83.7% (screen-to-body ratio) |
| Display resolution | 720x1280 pixels | 1116x2484 pixels (20:9) |
| Touchscreen | Capacitive Multitouch | Capacitive Multitouch |
| Pixel density (dot pitch) | 277 PPI | 432 PPI |
| Colors | 16 million | 1 billion |
| Scratch-resistant glass | Not supported | Gorilla Glass 7i |
| Refresh rate | feature not registered | 120Hz |
| Display features | feature not registered | 880nits[typ], 1400nits[peak] |
🤖 Operating System | ||
| LG X400 (K121K) | Fairphone 6 | |
| System version | Android 7.0 Nougat | Android 15 |
| Firmware update | Android 8.0 Oreo | Android 16 |
| User Interface | feature not registered | feature not registered |
⚙️ Processor | ||
| LG X400 (K121K) | Fairphone 6 | |
| Chipset | 64bit: MediaTek MT6750 (28nm) | 64bit: Qualcomm Snapdragon 7s Gen 3 (SM7635) (4nm) |
| CPU | Octa-core, 2 processors: 4x 1.5GHz ARM Cortex-A53 (Quad-core) 4x 1GHz ARM Cortex-A53 (Quad-core) | Octa-core, 3 processors: 1x 2.5GHz ARM Cortex-A720 (Single-core) 3x 2.4GHz ARM Cortex-A720 (Triple-core) 4x 1.8GHz ARM Cortex-A520 (Quad-core) |
| GPU graphical controller | ARM Mali-T860 MP2 520Mhz | Qualcomm Adreno 810 (1GHz) |
| Performance (benchmark) | feature not registered | AnTuTu: 786958 (v10) |
💽 Memory and storage | ||
| LG X400 (K121K) | Fairphone 6 | |
| RAM memory | 2GB LPDDR3 | 8GB LPDDR5 |
| Internal storage | 32GB (22GB available) | 256GB (220GB available) UFS 3.1 |
| External storage | Until 256GB microSD, microSDXC (dedicated slot) | Until 2TB microSD, microSDXC (dedicated slot) |
📶 Mobile networks | ||
| LG X400 (K121K) | Fairphone 6 | |
| Dual-SIM | Not supported | Dual-SIM Standby - Call active on one sim card (dedicated slot) |
| SIM card | 1 slot (Single-SIM) nano-SIM (4FF) | 1 slot (Single-SIM) nano-SIM (4FF) + e-SIM |
| Maximum Download / Upload | 300/50 Mbps | 3000/1024 Mbps |
| Network technology | 2G, 3G, 4G | 2G, 3G, 4G, 5G |
| 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 Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 17, 20, 25, 26, 28, 32, 66, 71) TD-LTE (38, 40, 41, 42) VoLTE |
| Primary 5G network | Not supported | SA/NSA/Sub6 (1, 2, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 71, 77, 78) |
| Primary data network | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, LTE, LTE-A | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA, Sub6 |
| Secondary 2G network | Not supported | Not supported |
| Secondary 3G network | Not supported | Not supported |
| Secondary 4G network | Not supported | Not supported |
| Secondary data network | Not supported | Not supported |
📷 Camera | ||
| LG X400 (K121K) | Fairphone 6 | |
| Back camera (main camera) | 13 megapixels | (triple camera) 50 megapixels 13MP ultrawide f/2.21/3.06"1.12μmPDAF 0.3MP depth TOF-3D |
| Main camera resolution | 4160x3120 pixels | 8160x6120 pixels |
| Video recording (primary) | Full HD (1920x1080) 30 fps | 4K UHD (3840x2160) 30 fps |
| Flash | LED flash | Dual-LED flash |
| Focal aperture | f/2.2 (aperture) | f/1.6 (aperture) |
| Focal length | feature not registered | feature not registered |
| Sensor size | 1/3" inches | 1/1.56" inches |
| Pixel size | 1.12µm pixel | 1µm pixel |
| Autofocus | Autofocus | PDAF on back camera and autofocus front camera |
| Touch focus | Supported | Supported |
| Image stabilization | EIS: Digital stabilization | OIS: Optical stabilization |
| Zoom | Only digital zoom | Only digital zoom |
| Face/smile detection | Face detection, Smile detection | Face detection, Smile detection |
| BSI sensor | Not supported | Supported |
| HDR | HDR photo only main camera | HDR photo on both cameras |
| Camera extras | feature not registered | 4K@30fps 1080p@30/60/120fps 720p@240fps Sony Lytia 700C Samsung KD1 |
📸 Front camera | ||
| LG X400 (K121K) | Fairphone 6 | |
| Front camera (secondary) | 5 megapixels | 32 megapixels |
| Front camera resolution | 2560x1920 pixels | 6528x4896 pixels |
| Video recording (secondary) | Full HD (1920x1080) | 4K UHD (3840x2160) |
| 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 | 1/3.42" inches |
| Pixel size | 1.12µm pixel | feature not registered |
🔉 Sound and multimedia | ||
| LG X400 (K121K) | Fairphone 6 | |
| Loudspeaker | Supported | Stereo sound |
| Active noise cancellation | 2 microphones or more | 2 microphones |
| 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, XviD, MKV |
| Audio formats | MP3, WAV, WMA, eAAC+, FLAC | MP3, WAV, WMA, eAAC+, FLAC |
🔌 Connectivity | ||
| LG X400 (K121K) | Fairphone 6 | |
| 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 reversible connector |
| TV output | Not supported | USB Type-C (reversible) |
| Bluetooth | 4.2 + A2DP | 5.4 + A2DP/LE |
| WiFi | 802.11 b/g/n [wifi4] (2.4GHz) WiFi Direct, hotspot | 802.11 a/b/g/n/ac/ax [wifi6E/6] (2.4GHz, 5GHz, 6GHz) + MIMO WiFi Direct, hotspot |
| DLNA | Not supported | Not supported |
| GPS | A-GPS, GeoTagging, GLONASS | A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou |
| NFC | Supported | Supported |
| Infrared port | Not supported | Not supported |
🧭 Sensors | ||
| LG X400 (K121K) | Fairphone 6 | |
| Sensors | Accelerometer Ambient light sensor Compass Fingerprint sensor (rear-mounted) Proximity sensor | Accelerometer Ambient light sensor Barometer Compass Face unlock 2D Fingerprint sensor (side-mounted) Gyroscope Hall effect Proximity sensor |
| Vibrating alert | Supported | Supported |
🔋 Battery | ||
| LG X400 (K121K) | Fairphone 6 | |
| Battery type | Li-Ion: lithium-ion (Removable) | Li-Ion: lithium-ion (Removable) |
| Battery capacity | 2800 mAh | 4415 mAh |
| Charger, watts | Wired charging | 30W Wired fast charging |
| Inductive / wireless charging | feature not registered | Not supported |
| Talk time autonomy | 9 hours | feature not registered |
| Standby | 390 hours (16.3 days) | feature not registered |
➕ Other features | ||
| LG X400 (K121K) | Fairphone 6 | |
| 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: Horizon Black, Cloud White, Forest Green iFixit: 10/10 |
☢️ Radiation rate | ||
| LG X400 (K121K) | Fairphone 6 | |
| SAR 1.6W/kg (USA, Mexico, etc.) | feature not registered | feature not registered |
| SAR 2W/kg (Europe, UK, etc.) | feature not registered | 0.49W/kg (head), 1.39W/kg (body) |