| Brand | Realme |
| First Release | July 2, 2021 |
| Model | C21Y |
| Connectivity | |
| Network | 2G, 3G, 4G |
| SIM | Dual Nano SIM |
| WLAN | Wi-Fi hotspot |
| Bluetooth | v5.0, A2DP, LE |
| GPS | A-GPS, GLONASS, GALILEO, BDS |
| USB | v2.0 |
| OTG | Yes |
| Body | |
| Style | Minimal Notch |
| Material | Glass front, Plastic body |
| Dimensions | 164.5 x 76 x 9.1 millimeters |
| Weight | 200 grams |
| Display | |
| Size | 6.5 inches |
| Resolution | HD+ 720 x 1600 pixels (270 ppi) |
| Technology | IPS LCD Touchscreen |
| Features | Multitouch |
| Back Camera | |
| 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 | |
| Resolution | 5 Megapixel |
| Features | HDR, f/2.2, 1/5.0″, 1.12µm & more |
| Video Recording | Full HD (1080p) |
| Battery | |
| Type and Capacity | Lithium-polymer 5000 mAh (non-removable) |
| Fast Charging | 10W Fast Charging |
| Reverse Charging | Yes |
| Performance | |
| Operating System | Android 10 (Realme UI) |
| Chipset | Unisoc T610 (12 nm) |
| Storage | |
| RAM | 3 GB |
| ROM | 32 GB (eMMC 5.1) |
| MicroSD Slot | Dedicated slot |
| Processor | octa core, up to 2.0 GHz |
| GPU | Mali-G52 |
| Sound | |
| 3.5mm Jack | Yes |
| Features | Loudspeaker |
| Security | |
| Fingerprint | On the back |
| Face Unlock | Yes |
Others | Notification Light Sensors Accelerometer, Proximity, Gyroscope, E-Compass |
Realme C21Y comes with 6.5 inches HD+ IPS LCD screen. It has a full-view waterdrop notch design. The back camera is of triple 13+2+2 MP with PDAF, LED flash, depth sensor, dedicated macro camera etc. and Full HD video recording. The front camera is of 5 MP. Realme C21Y comes with 5000 mAh big battery and 10W fast charging. It has 3 GB RAM, up to 2.3 GHz octa-core CPU and Mali G52 GPU. It is powered by a Unisoc T610 (12 nm) chipset.
The device comes with 32 GB internal storage and dedicated MicroSD slot. There is a back-mounted fingerprint sensor in this phone.
Among other features, there is Dual SIM, face unlock etc.
✔ 6.5 inches big HD+ display.
✔ New Unisoc T610 (12 nm) chipset.
✔ 5000 mAh big battery.
✔ 3/32GB version.
✔ Adequate camera for the price.