| Oppo Realme C21 |
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| Hardware and OS | Oppo Realme C21 | |
| Operating system | Android 10, Realme UI | |
| Processor | Octa-core (4x2.3 GHz Cortex-A53 & 4x1.8 GHz Cortex-A53) | |
| Chipset | MediaTek Helio G35 (12 nm) | |
| Internal memory | 32GB 3GB RAM, 64GB 4GB RAM | |
| External memory | microSDXC (dedicated slot) | |
| GPU | PowerVR GE8320 | |
| Display | Oppo Realme C21 | other phones |
| Type | IPS LCD | |
| Size | 6.5" inc | |
| Resolution | 720 x 1600 px | |
| Display colors | 16M | |
| Screen area | 102.0 cm2 | |
| Screen format | 20:9 (height:width) | |
| Screen to body ratio | 80.8% | |
| PPI /points per inch/ | 270 PPI | |
| Touchscreen | capacitive touchscreen | |
| Connectivity | Oppo Realme C21 | other phones |
| Network | GSM / HSPA / LTE | |
| NFC | No | |
| Edge | Yes | |
| Bluetooth | 5.0, A2DP, LE | |
| SIM card | Dual SIM (Nano-SIM, dual stand-by) | |
| GPRS | Yes | |
| GPS | Yes, with A-GPS, GLONASS, BDS | |
| Wi-Fi | Wi-Fi 802.11 b/g/n, hotspot | |
| USB | microUSB 2.0, USB On-The-Go | |
| Camera | Oppo Realme C21 | other phones |
| Rear camera, main | 13 MP, Dual | |
| Camera specs | 13 MP, f/2.2, 26mm (wide), 1/3.06'', 1.12µm, PDAF -2 MP, f/2.4, (macro) -2 MP, f/2.4, (depth) | |
| Functions | LED flash, HDR, panorama | |
| Video | 1080p@30fps | |
| Front camera, selfie | 5 MP, Single | |
| Specifications | 5 MP, f/2.2, (wide), 1/5.0'', 1.12µm | |
| Multimedia | Oppo Realme C21 | other phones |
| Headphone jack | Yes | |
| Radio | FM radio | |
| Design | Oppo Realme C21 | other phones |
| Dimensions (HxWxD) | 165.2 x 76.4 x 8.9 mm | 6.5 x 3.01 x 0.35 in | |
| Weight | 190 g | 6.7 oz | |
| Colors | Cross Black, Cross Blue | |
| Body build | Glass front, plastic back, plastic frame | |
| Battery | Oppo Realme C21 | other phones |
| Battery | 5000 mAh, Li-Po, non-removable | |
| Other features | Oppo Realme C21 | other phones |
| Sensors | Fingerprint (rear-mounted), accelerometer, proximity, compass Charging 10W -Reverse charging |
