| Hardware and OS | Xiaomi Redmi S3 | |
| Operating System | Android v8.0 (Oreo) | |
| Custom UI | MIUI | |
| Processor | Octa core (1.8 GHz, Quad core, Kryo 260 1.6 GHz, Quad core, Kryo 260) | |
| Chipset | Qualcomm Snapdragon 636 | |
| Architecture | 64 bit | |
| Internal Memory | 32 GB | |
| External memory | Yes, Up to 256 GB | |
| RAM | 3 GB | |
| GPU | Adreno 509 | |
| Display | Xiaomi Redmi S3 | other phones |
| Type | IPS LCD | |
| Size | 5.99 inches (15.21 cm) | |
| Screen format | 18:9 | |
| PPI /points per inch/ | 406 ppi | |
| Touchscreen | Yes, Capacitive Touchscreen, Multi-touch | |
| Screen Protection | Corning Gorilla Glass, | |
| Connectivity | Xiaomi Redmi S3 | other phones |
| 4G Bands | TD-LTE 2300(band 40), FD-LTE 1800(band 3) | |
| Network Support | 4G, 3G, 2G | |
| SIM card | SIM1: Nano, SIM2: Nano | |
| SIM Slot(s) | Dual SIM, GSM GSM | |
| Bluetooth | Yes, v5.0 | |
| GPS | Yes with A-GPS | |
| USB Connectivity | Mass storage device, USB charging, microUSB 2.0 | |
| VoLTE | Yes | |
| Wi-Fi | Yes, Wi-Fi 802.11, b/g/n | |
| Camera | Xiaomi Redmi S3 | other phones |
| Main camera | 13 MP, Primary Camera, 13 MP, | |
| Camera Setup | Dual | |
| Autofocus | Yes, Phase Detection autofocus | |
| Camera Features | Digital Zoom, Auto Flash, Face detection, Touch to focus | |
| Flash | Yes, Dual-color LED Flash | |
| Image Resolution | 4128 x 3096 Pixels | |
| Selfie camera | 5 MP, Primary Camera, | |
| Multimedia | Xiaomi Redmi S3 | other phones |
| Headphone jack | 3.5 mm | |
| Loudspeaker | Yes | |
| Battery | Xiaomi Redmi S3 | other phones |
| Capacity | 3300 mAh | |
| Type | Li-ion | |
| Removable | No | |
| USB Type-C | No | |
| Other features | Xiaomi Redmi S3 | other phones |
| Fingerprint Sensor | Yes | |
| Other Sensors | Light sensor, Proximity sensor, Accelerometer, Compass, Gyroscope | |
