| Hardware and OS | TCL 21 Pro | |
| Operating system | Android v11 | |
| Processor | Qualcomm Snapdragon 690G (8 nm) | |
| RAM | 6 GB | |
| Internal Storage | 128 GB | |
| Display | TCL 21 Pro | other phones |
| Type | IPS LCD | |
| Size | 6.67 inches | |
| Resolution | 1080 x 2400 Pixels | |
| Pixel Density | 395 ppi | |
| Touchscreen | Yes, Capacitive Touchscreen, Multi-touch | |
| Aspect ratio | 20:9 | |
| Connectivity | TCL 21 Pro | other phones |
| Network support | 5G , 4G , 3G, 2G | |
| WI-FI | Yes, Wi-Fi 802.11, ac/b/g/n/n 5GHz | |
| Gps | Yes, with A-GPS, Glonass | |
| Bluetooth | Yes, v5.0 | |
| Dual SIM | Dual SIM, GSM GSM | |
| SIM size | SIM1: Nano, SIM2: Nano | |
| USB connectivity | Mass storage device, USB charging | |
| Camera | TCL 21 Pro | other phones |
| Front camera resolution | 8 MP, f/2.2, 26mm (wide) | |
| Camera features | Digital Zoom, Auto Flash, Face detection, Touch to focus | |
| Flash | Yes, Dual LED Flash | |
| Autofocus | Yes | |
| Video recording | Yes | |
| Multimedia | TCL 21 Pro | other phones |
| Loudspeaker | Yes | |
| Design | TCL 21 Pro | other phones |
| Height | 164.2 mm | |
| Width | 77.5 mm | |
| Thickness | 9.4 mm | |
| Weight | 210 grams | |
| Colours | Diamond Gray | |
| Battery | TCL 21 Pro | other phones |
| Capacity | 4500 mAh | |
| Type | Lithium Polymer | |
| Other | TCL 21 Pro | other phones |
| Fingerprint sensor | Yes | |
| Fingerprint sensor position | Rear | |
| Other sensors | Accelerometer, Gyro, Proximity, Compass | |
