Oukitel K3 vs Oukitel C21
| Type | Touch | Touch |
| Dimensions | - | 157.30 x 75.50 x 8.75 mm |
| Weight | 209.00 g | 170.00 g |
| Display size | 5.50" | 6.40" |
| Display | Color / TFT 16M colors 1080 x 1920 px (5.50") 401 ppi | Color / IPS TFT 16M colors 60 Hz 1080 x 2310 px (6.40") 398 ppi |
| Display protection | Asahi Dragontrail Buy screen protector
 |  |
| Additional display | | |
| Protection of the secondary display | | |
| Talk time (max.) | 2G: 2400 min. (40.0 h) |  |
| Stand-by (max.) | 2G: 400 h. (16.7 days) | |
| Playback time (max.) | Audio: 48 h (2.0 days) Video: 11 h (0.5 days) | nd |
| Standard battery | Li-Ion 6000 mAhBuy powerbank
| Li-Ion 4000 mAhBuy powerbank
|
| Quick battery charging | Pump Express | |
| Wireless battery charging | | |
| Internal memory | 64 GB | 64 GB |
| RAM memory | 4 GB | 4 GB |
| Memory cards |  microSD, microSDHC, microSDXC up to 256 GBBuy memory card | microSD, microSDHC, microSDXC |
| Operating system | Android 7.0 Nougat | Android 10 |
| Processor | MediaTek MT6750T | MediaTek Helio P60 MT6771 |
| Processor clock | 1500 MHz | 2000 MHz |
| GPU | ARM Mali-T860 MP2 @500 | ARM Mali-G72 MP3 @800 MHz |
| Touchscreen | | |
| DualSIM | | |
| SIM cards standard | DualSIM(nanoSIM, nanoSIM) | DualSIM(nanoSIM, nanoSIM) |
| DualSIM mode | dual standby | dual standby |
| Hybrid DualSIM | | nanoSIM, microSD |
| Announced | 3Q 2017 | 3Q 2020 |
| Other names | - | - |
| GSM frequencies | 850 900 1800 1900 | 850 900 1800 1900 |
| UMTS | 900 1900 2100 | 900 2100 |
| LTE standard | FDD LTE: 2600, 2100, 1800, 900, 800 | FDD LTE: 2600, 2100, 1900, 1800, 1700, 900, 850, 800, 700 |
| Standard 5G | | |
| CDMA | | |
| Standard TD-SCDMA | | |
| UMA | | |
CAMERAS - BACK
| First camera | | |
| Camera type | | Standard |
| Photo sensor model | | OmniVision OV16880P |
| Photo matrix | 13 Mpx | 16 Mpx |
| Sensor size | | 1/3,06 |
| Resolution | 4128x3096 px | 4672x3504 px |
| Optical zoom | | |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video formats | MPEG4, H.263, H.264 | H.263, H.264, MPEG4 |
| Additional | - | AF, f/2.0 |
| Second camera | | |
| Camera type | | Depth of field |
| Photo matrix | 2 Mpx | 2 Mpx |
| Pixel size | | 1,8 µm |
| Resolution | 1600x1200 px | 1600x1200 px |
| Optical zoom | | |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video formats | MPEG4, H.263, H.264 | H.263, H.264, MPEG4 |
| Additional | - | FF, GalaxyCore GC2385 |
| Third camera | | |
| Camera type | nd | Macro |
| Photo matrix | nd | 2 Mpx |
| Optical zoom | nd | |
| Flash | nd | LED |
| Dual-colour LED flash | nd | |
| Video formats | nd | H.263, H.264, MPEG4 |
| Additional | nd | FF |
| Fourth camera | | |
| Photo matrix | nd | 2 Mpx |
| Optical zoom | nd | |
| Flash | nd | |
| Dual-colour LED flash | nd | |
| Video formats | nd | H.263, H.264, MPEG4 |
| Additional | nd | FF |
CAMERAS - FRONT
| First camera | | |
| Camera type | | Portrait |
| Photo sensor model | | Samsung S5K3T1 |
| Photo matrix | 13 Mpx | 20 Mpx |
| Sensor size | | 1/3,1 |
| Pixel size | | 0,9 µm |
| Resolution | 4128x3096 px | 5184x3880 px |
| Optical zoom | | |
| Flash | LED | |
| Dual-colour LED flash | | |
| Video formats | MPEG4, H.263, H.264 | H.263, H.264, MPEG4 |
| Additional | - | FF, f/2.0 |
| Second camera | | |
| Photo matrix | 2 Mpx | nd |
| Resolution | 1600x1200 px | nd |
| Optical zoom | | nd |
| Flash | LED | nd |
| Dual-colour LED flash | | nd |
| Video formats | MPEG4, H.263, H.264 | nd |
| Additional | - | nd |
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 |
| HSUPA | | 5.76 Mbit/s |
| HSPA | | |
| HSPA+ | | |
| LTE DL | | - |
| LTE UP | | - |
| WIMAX+ | | |
| GPRS | | |
| EDGE | | |
| Bluetooth | | v5.0 |
| A2DP Profile | | |
| HDMI | | |
| WiFi | v802.11 a/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 Type-C |
| GPS | | |
| A-GPS | | |
| GLONASS | | |
| Beidou | | |
| NFC | | |
COMMUNICATION AND MESSAGING
| Call waiting | | |
| Conferency | | |
| Call forwarding | | |
| Push To Talk | | |
| Instant Messenger | | |
| SMS | | |
| EMS | | |
| MMS | | |
| Dictionary | XT9 | T9 |
| Swype | | |
| e-mail client | POP3, IMAP4, SMTP | POP3, IMAP4, SMTP |
| Hardware QWERTY keyboard | | |
| RSS Reader | | |
Multimedia
| Radio | | |
| MP3 | | |
| Stereo speakers | | |
| Audio Jack | 3.5 mm | 3.5 mm |
| HD Voice | | |
| Sound formats | AAC, AAC+, AMR, WAV, eAAC+ | AAC, AAC+, ALAC, AMR, APE, FLAC, MID, MKA, WAV, 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 | | |