| Hardware and OS | Cat S31 | |
| Operating system | Android 7.0 (Nougat) | |
| Processor | Quad-core 1.3 GHz Cortex-A7 | |
| Chipset | Qualcomm MSM8909 Snapdragon 210 (28 nm) | |
| GPU | Adreno 304 | |
| Internal memory | 16 GB, 2 GB RAM | |
| External memory | microSD, up to 64 GB (dedicated slot) | |
| Display | Cat S31 | other phones |
| Type | TFT | |
| Size | 4.7" inc | |
| Resolution | 720 x 1280 px | |
| Protection | Corning Gorilla Glass 3 | |
| Touchscreen | capacitive touchscreen | |
| Screen-to-Body Ratio | 56.1% | |
| Display area | 60.9 cm2 | |
| Display aspect ratio | 16:9 (height:width) | |
| Pixel Density | 312 PPI | |
| Connectivity | Cat S31 | other phones |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM model only) | |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 - EU | |
| 4G Network | LTE band 1(2100), 2(1900), 3(1800), 5(850), 7(2600), 8(900), 20(800) - EU | |
| Wi-Fi | Wi-Fi 802.11 b/g/n, hotspot | |
| Network | GSM / HSPA / LTE | |
| SIM card | Single SIM (Nano-SIM)Dual SIM (Nano-SIM, dual stand-by) | |
| Bluetooth | 4.1, A2DP, LE | |
| Edge | Yes | |
| GPRS | Yes | |
| GPS | Yes, with A-GPS, GLONASS, BDS | |
| Speed | HSPA, LTE Cat4 150/50 Mbps | |
| USB | microUSB 2.0, USB On-The-Go | |
| Camera | Cat S31 | other phones |
| Main camera | 8 MP, Single | |
| Specs | 8 MP, AF | |
| Features | LED flash | |
| Video | 720p@30fps | |
| Selfie camera | 2 MP, Single | |
| Multimedia | Cat S31 | other phones |
| 3.5 mm Jack | Yes | |
| Radio | FM radio | |
| Design | Cat S31 | other phones |
| Colors | Black | |
| Dimensions | 146 x 74.4 x 12.6 mm | |
| Weight | 200 g | |
| Battery | Cat S31 | other phones |
| Battery capacity | 4000 mAh, Non-removable Li-Ion | |
| Other | Cat S31 | other phones |
| Release date | 2017, September | |
| Sensors | Accelerometer, proximity, compass | |
