LG K4 LTE K121 vs LG K10 2017
| Type | Touch | Touch |
| Dimensions | 131.90 x 66.70 x 8.90 mm | 148.70 x 75.30 x 7.90 mm |
| Weight | 120.00 g | 142.00 g |
| Display size | 4.50" | 5.30" |
| Display | Color / TFT 480 x 854 px (4.50") 218 ppi | Color / IPS TFT 16M colors 720 x 1280 px (5.30") 277 ppi |
| Display protection |   | Corning Gorilla Glass Buy screen protector
|
| Additional display | | |
| Protection of the secondary display | | |
| Standard battery | Li-Ion 1940 mAhBuy powerbank
| Li-Ion 2800 mAhBuy powerbank
|
| Quick battery charging | | |
| Wireless battery charging | | |
| Internal memory | 8 GB | 16 GB, 32 GB |
| End-user memory |  | 11.7 GB |
| RAM memory | 1 GB | 2 GB |
| Memory cards |  microSD, microSDHC, microSDXC up to 32 GBBuy memory card | microSD, microSDHC, microSDXC up to 2000 GBBuy memory card |
| Operating system | Android 5.1.1 Lollipop | Android 7.0 Nougat |
| Processor | Qualcomm Snapdragon 210 MSM8909 | MediaTek MT6750 |
| Processor clock | 1100 MHz | 1500 MHz |
| GPU | Adreno 304 | ARM Mali-T860 MP2 @520 MHz |
| Touchscreen | | |
| DualSIM | | |
| SIM cards standard | SingleSIM(microSIM) | SingleSIM(nanoSIM) |
| Announced | 1Q 2016 | 1Q 2017 |
| Other names | - | M250n |
| GSM frequencies | 850 900 1800 1900 | 850 900 1800 1900 |
| UMTS | 850 900 2100 | 850 900 1900 2100 |
| LTE standard | FDD LTE: 2600, 1800, 800 | FDD LTE: 2600, 2100, 1800, 900, 800 |
| CDMA | | |
| Standard TD-SCDMA | | |
| UMA | | |
CAMERAS - BACK
| First camera | | |
| Photo matrix | 5 Mpx | 13 Mpx |
| Resolution | 2592x1944 px | 4128x3096 px |
| Optical zoom | | |
| Digital zoom | | 4x |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video resolution | 1280x720 px | 1920x1080 px |
| Video formats | | MPEG4, H.263, H.264 |
| Additional | AF | AF, f/2.2 |
CAMERAS - FRONT
| First camera | | |
| Photo matrix | 2 Mpx | 5 Mpx |
| Resolution | 1920x1080 px | 2592x1944 px |
| Optical zoom | | |
| Flash | | |
| Dual-colour LED flash | | |
| Video formats | | MPEG4, H.263, H.264 |
| Additional | FF | FF, f/2.4 |
SENSORS
| Accelerometer | | |
| Proximity | | |
| Light | | |
| Magnetometer | | |
| Gyroscope | | |
| Barometer | | |
| Altimeter | | |
| Gravity | | |
| Hall-effect | | |
| Iris scanner | | |
| Fingerprint scanner | | |
| Thermometer | | |
| Hygrometer | | |
Data transfer
| xHTML | | |
| WAP | v2.0 | v2.0 |
| HSCSD | | |
| HSDPA | 42.20 Mbit/s | 42.20 Mbit/s |
| HSUPA | 5.76 Mbit/s | 5.76 Mbit/s |
| HSPA | | |
| HSPA+ | | |
| LTE DL | | - |
| LTE UP | | 51.00 Mbit/s |
| WIMAX+ | | |
| GPRS | | class 12 |
| EDGE | | class 12 |
| Bluetooth | v4.0 LE | v4.2 |
| A2DP Profile | | |
| HDMI | | |
| WiFi | v802.11 b/g/n | v802.11 b/g/n |
| WiFi frequencies | 2,4 GHz | 2,4 GHz |
| WiFi Direct | | |
| WiFi Display | | |
| DLNA | | |
| Miracast | | |
| WiFi hotspot | | |
| IrDA | | |
| USB | v2.0 | v2.0 |
| GPS | | |
| A-GPS | | |
| GLONASS | | |
| Beidou | | |
| NFC | | |
COMMUNICATION AND MESSAGING
| Call waiting | | |
| Conferency | | |
| Call forwarding | | |
| Push To Talk | | |
| Instant Messenger | | |
| SMS | | |
| EMS | | |
| MMS | | |
| Dictionary | T9 | XT9 |
| Swype | | |
| e-mail client | POP3, IMAP4, SMTP | POP3, IMAP4, SMTP |
| Hardware QWERTY keyboard | | |
| RSS Reader | | |
Multimedia
| Radio | | z RDS |
| MP3 | | |
| Stereo speakers | | |
| Audio Jack | 3.5 mm | 3.5 mm |
| HD Voice | | |
| Sound formats | AAC, AAC+, AMR, FLAC, MIDI, OGG, PCM, WAV, eAAC+ | AAC, AAC+, AMR, FLAC, OGG, WMA, eAAC+ |
| Polyphony | | |
| Video ringtone | | |
| Ring composer | | |
| Games | | |
| Java | ART | ART |
| Videophone | | |
| DVB-H television | | |
| TV-Out | | |
PIM AND ADDITIONAL FUNCTIONS
| Watch | | |
| Stopwatch | | |
| Alarm | | |
| Calculator | | |
| Currency converter | | |
| Organizer | | |
| Calendar | | |
| Flight mode | | |
| SyncML | | |
| Data and fax | | |
| Screensaver | | |
| Themes | | |
| Interchangeable covers | | |
| Voice dial | | |
| Speakerphone | | |
| Recorder | | |
| Vibrations | | |