Realme C21 Full Specifications| First Release | March 5, 2021 | | Colors | Cross Black, Cross Blue | | Connectivity | |
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| Network | 2G, 3G, 4G | | SIM | Dual Nano SIM | | WLAN | ✅ Wi-Fi hotspot | | Bluetooth | ✅ v5.0, A2DP, LE | | GPS | ✅ A-GPS, GLONASS, BDS | | Radio | ✅ FM | | USB | v2.0 | | OTG | ✅ | | USB Type-C | ✖ | | Body | |
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| Style | Minimal Notch | | Material | Glass front, Plastic body | | Water Resistance | ✖ | | Dimensions | 165.2 x 76.4 x 8.9 millimeters | | Weight | 190 grams | | Display | |
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| Size | 6.5 inches | | Resolution | HD+ 720 x 1600 pixels (270 ppi) | | Technology | IPS LCD Touchscreen | | Protection | ✖ | | Features | Multitouch | | Back Camera | |
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| Resolution | Triple 13+2+2 Megapixel | | Features | PDAF, LED flash, 1/3.06″, 1.12µm, HDR, depth, macro & more | | Video Recording | Full HD (1080p) | | Front Camera | |
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| Resolution | 5 Megapixel | | Features | HDR, f/2.2, 1/5.0″, 1.12µm & more | | Video Recording | Full HD (1080p) | | Battery | |
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| Type and Capacity | Lithium-polymer 5000 mAh (non-removable) | | Fast Charging | ✅ 10W Fast Charging | | Reverse Charging | ✅ | | Performance | |
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| Operating System | Android 10 (Realme UI) | | Chipset | Mediatek Helio G35 (12 nm) | | RAM | 3GB | | Processor | Octa core, up to 2.3 GHz | | GPU | PowerVR GE8320 | | Storage | |
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| ROM | 32 GB (eMMC 5.1) | | MicroSD Slot | ✅ Dedicated slot | | Sound | |
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| 3.5mm Jack | ✅ | | Features | Loudspeaker | | Security | |
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| Fingerprint | ✅ On the back | | Face Unlock | ✅ | | Others |
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| Notification Light | | | Sensors | Fingerprint, Accelerometer, Proximity, E-Compass | | Manufactured by | Realme | | Made in | Bangladesh |
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