| Hardware and OS | Smartisan U3 4/128GB | |
| Operating system | Android | |
| Processor | Qualcomm Snapdragon 625 MSM8953, 2000 MHz | |
| Processor cores number | 8 | |
| RAM | 4 GB | |
| Internal Storage | 128 GB | |
| Memory Card Slot | yes | |
| GPU | Adreno 506 | |
| Display | Smartisan U3 4/128GB | other phones |
| Type | colored, sensor | |
| Size | 5.99" | |
| Resolution | 2160x1080 | |
| Pixel Density | 403 | |
| Touchscreen | multitouch, capacitive | |
| Scratch-resistant glass | yes | |
| Aspect Ratio | 18:9 | |
| Automatic display rotation | yes | |
| Connectivity | Smartisan U3 4/128GB | other phones |
| Standard | GSM 900/1800/1900, 3G, 4G LTE | |
| Interfaces | Wi-Fi 802.11ac, Bluetooth 4.1, USB | |
| GPS | BeiDou, A-GPS, GPS | |
| Multi SIM mode | alternate | |
| SIM-card amount | 2 | |
| Camera | Smartisan U3 4/128GB | other phones |
| Permissions of the main cameras | 13 MP, 13 MP | |
| The number of main cameras | 2 | |
| Aperture of the main camera | F, 2.20 | |
| Main camera functions | autofocus, macro mode | |
| Front camera | 8 megapixels | |
| Flash | rear, LED | |
| Video Recording | yes | |
| Multimedia | Smartisan U3 4/128GB | other phones |
| Audio | MP3, AAC, WAV, WMA | |
| Design | Smartisan U3 4/128GB | other phones |
| Case type | classic | |
| Height | 154 mm | |
| Width | 74.35 mm | |
| Thickness | 7.2 mm | |
| Weight | 145 grams | |
| Battery | Smartisan U3 4/128GB | other phones |
| Capacity | 4000 mA?h | |
| Battery | non-removable | |
| Connector type for charging | USB Type-C | |
| Quick charging function | yes, Qualcomm Quick Charge 3.0 | |
| Other | Smartisan U3 4/128GB | other phones |
| Sensors | illumination sensor, gyroscope, fingerprint scanner | |
| Flashlight | yes | |
