
The Nokia C21 succeeds the Nokia C20,retaining several key features from its predecessor. It has a 6.52-inch IPS LCD display with a resolution of 720 x 1600 pixels and a dewdrop notch housing the front camera.

The device is powered by the Unisoc SC9863A chipset, featuring an octa-core CPU clocked at 1.6 GHz and a PowerVR GE8322 GPU. It is available with 2 GB or 3 GB of RAM and offers internal storage options of 32 GB or 64 GB, expandable via microSD card.
The rear camera setup includes a single 8-megapixel sensor with an LED flash. the front camera is a 5-megapixel sensor. Both cameras support video recording at 720p resolution.

The Nokia C21 includes a rear-mounted fingerprint sensor. It supports both single and dual SIM configurations. Connectivity options include Bluetooth 4.2 and USB 2.0. The device is equipped with a 3000 mAh battery and runs Android 11 (Go edition) out of the box.
| Technology | GSM / HSPA / LTE |
| 2G Network Bands | GSM 850 / 900 / 1800 / 1900 - SIM 1 and SIM 2 (dual-SIM model only) |
| 3G Network Bands | HSDPA 850 / 900 / 2100 |
| 4G Network Bands | LTE band 2(1900), 4(1700/2100), 7(2600), 12(700), 17(700) |
| Speed | HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps |
| Also Known As |
- - |
| Dimensions | 169.9 x 77.9 x 8.8 mm |
| Weight | 195 grams |
| Build | Glass front / Aluminum frame / Plastic back |
| SIM Type | Single SIM (Nano-SIM) or Dual SIM (Nano-SIM, dual stand-by) |
| Display Type | IPS LCD capacitive touchscreen, 16M colors |
| Size | 6.52 inches, (77.5% screen-to-body ratio) |
| Resolution | 720 x 1600 pixels, 20:9 ratio (269 ppi density) |
| Operating System | Android 11 (Go Edition) |
| Chipset | Spreadtrum UniSoC SC9863A |
| CPU | Octa-core (4x1.6 GHz Cortex-A55 & 4x1.2 GHz Cortex-A55) |
| GPU | PowerVR GE8322 |
| RAM + ROM | 2GB + 32GB / 3GB + 32GB / 3GB + 64GB |
| Card Slot | Yes, up to 128GB via microSD card (uses SIM 2 slot) |
| Camera Type | Single Lens |
| Camera Sensor(s) | 8 MP Main cameras |
| Camera Features | Autofocus / Digital zoom / HDR / Touch focus / Face detection / LED flash |
| Video Resolution | 720p@30fps |
| Camera Type | Single Lens |
| Camera Sensor(s) | 5 megapixel |
| Camera Features |
Face Beautification FaceID |
| Video Resolution | 720p |
| Loudspeaker | Yes |
| Speaker Location | Placed at the base of the phone |
| Audio Jack Type | Yes, 3.5mm audio jack |
| Bluetooth | Bluetooth 4.2, A2DP |
| NFC | |
| GPS | Yes |
| FM Radio | Yes |
| Battery Capacity | Removable Li-Ion 3000 mAh battery |
| Sensors | Fingerprint (side-mounted), accelerometer, proximity, compass |
| Box Contents | Charging Brick / USB cable |
Note: Specifications may not be 100% accurate.