| Realme C21 |
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| Hardware and OS | Realme C21 | |
| Operating System | Android v10 (Q) | |
| Processor | Octa core, 2.3 GHz, Cortex A53 | |
| Chipset | MediaTek Helio G35 | |
| RAM | 3 GB | |
| Internal Memory | 32 GB | |
| Expandable Memory | Yes, Up to 256 GB | |
| Custom UI | Realme UI | |
| Graphics | PowerVR GE8320 | |
| Display | Realme C21 | other phones |
| Screen Size | 6.5 inches (16.51 cm) | |
| Resolution | 720 x 1600 pixels | |
| Display Type | IPS LCD | |
| Pixel Density | 270 ppi | |
| Touch Screen | Yes, Capacitive Touchscreen, Multi-touch | |
| Aspect Ratio | 20:9 | |
| Screen to Body Ratio | 89.5 % | |
| Main Camera | Realme C21 | other phones |
| Resolution | 13 MP f/2.2 (upto 4x Digital Zoom), Wide Angle Primary Camera(26 mm focal length, 3" sensor size, 1.12µm pixel size)2 MP f/2.4, Macro Camera(1.75µm pixel size)2 MP f/2.4 Mono Camera(1.75µm pixel size) | |
| Image Resolution | 4128 x 3096 Pixels | |
| Flash | Yes, LED Flash | |
| Camera Features | 4 x Digital Zoom Auto Flash Face detection Touch to focus | |
| Autofocus | Yes, Phase Detection autofocus | |
| Camera Setup | Triple | |
| Sensor | CMOS image sensor | |
| Video Recording | 1920x1080 @ 30 fps | |
| Settings | Exposure compensation, ISO control | |
| Front Camera | Realme C21 | other phones |
| Resolution | 5 MP f/2.2, Wide Angle Primary Camera(5.0" sensor size, 1.12µm pixel size) | |
| Camera Setup | Single | |
| Video Recording | 1920x1080 @ 30 fps | |
| Camera Features | Fixed Focus | |
| Connectivity | Realme C21 | other phones |
| Network | 4G , 3G, 2G | |
| Bluetooth | Yes, v5.0 | |
| NFC | No | |
| GPS | Yes with A-GPS, Glonass | |
| VoLTE | Yes | |
| Wi-Fi | Yes, Wi-Fi 802.11, b/g/n, MIMO | |
| Wi-Fi Features | Mobile Hotspot | |
| USB Connectivity | Mass storage device, USB charging, microUSB 2.0 | |
| Multimedia | Realme C21 | other phones |
| Audio Jack | 3.5 mm | |
| Design | Realme C21 | other phones |
| Height | 165.2 mm | |
| Width | 76.4 mm | |
| Thickness | 8.9 mm | |
| Weight | 190 grams | |
| Build Material | Back: Plastic | |
| Colours | Cross Blue, Cross Black | |
| Battery | Realme C21 | other phones |
| Type | Li-ion | |
| Capacity | 5000 mAh | |
| Removable | No | |
| USB Type-C | No | |
| Features | Realme C21 | other phones |
| Fingerprint Sensor | Yes | |
| Other Sensors | Light sensor, Proximity sensor, Accelerometer |
