| Brand: | Vivo |
| Model: | Y31s |
| Type: | Smartphone |
| Release Date: | 2021, January 12 |
| Size: | 6.58 inches, 104.8 cm2 (~84.7% screen-to-body ratio) |
| Resolution: | 1080 x 2408 pixels, 20:9 ratio (~400 ppi density) |
| Technology: | IPS LCD, 90Hz |
| Main Specs: | 13 MP, f/2.2, (wide), PDAF, 2 MP, f/2.4, (depth) |
| Main Features: | LED flash, HDR, panorama |
| Main Video: | 4K@30fps, 1080p@30fps |
| Selfie Specs: | 8 MP, f/2.0, (wide) |
| Selfie Features: | HDR |
| Selfie Video: | 1080p@30fps |
| Capacity: | Li-Po 5000 mAh, non-removable |
| Type: | Li-Po |
| Chipset: | Qualcomm SM4350 Snapdragon 480 5G (8 nm) |
| Ram: | 4GB |
| Storage: | 64GB |
| Expandable: | No |
| Os Version: | 10.5 |
| Dimensions: | 164.2 x 75.4 x 8.4 mm (6.46 x 2.97 x 0.33 in) |
| Weight: | 185.5 g (6.56 oz) |
| Wifi: | Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct, hotspot |
| Bluetooth: | 5.1, A2DP, LE, aptX HD |
| Nfc: | No |
| Usb: | USB Type-C 2.0, USB On-The-Go |
| Headphone Jack: | Yes |
| Network: | GSM / CDMA / HSPA / CDMA2000 / LTE / 5G |
| Sensors: | Fingerprint (side-mounted), accelerometer, proximity, compass |
| Colors: | Red, Gray, Aurora |