| Hardware and OS HTC U21 |
| Operating system: | Android v10 (Q) |
| Processor: | Qualcomm SDM765 Snapdragon 765G (7 nm) |
| RAM: | 8 GB |
| Internal Storage: | 256 GB |
| Display HTC U21 |
| Type: | IPS LCD |
| Size: | 6.8 inches |
| Resolution: | 1080 x 2400 Pixels |
| Pixel Density: | 378 ppi |
| Touchscreen: | Yes, Capacitive Touchscreen, Multi-touch |
| Connectivity HTC U21 |
| 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 |
| NFC: | Yes |
| Dual SIM: | Dual SIM, GSM GSM |
| SIM size: | SIM1: Nano, SIM2: Nano |
| USB connectivity: | Mass storage device, USB charging |
| Camera HTC U21 |
| Front camera resolution: | 32 MP, f/2.0, (wide), 1/2.8", 0.8µm) |
| Camera features: | Digital Zoom, Auto Flash, Face detection, Touch to focus |
| Flash: | Yes, LED Flash |
| Autofocus: | Yes |
| Video recording: | Yes |
| Multimedia HTC U21 |
| Audio jack: | 3.5 MM |
| Loudspeaker: | Yes |
| Design HTC U21 |
| Colours: | Green, White |
| Battery HTC U21 |
| Capacity: | 5000 mAh |
| Type: | Lithium Polymer |
| Other HTC U21 |
| Fingerprint sensor: | Yes |
| Fingerprint sensor position: | Rear |
| Other sensors: | Accelerometer, Gyro, Proximity, Compass, SAR |
