| Brand: | Vivo |
| Model: | X21S |
| Type: | Smartphone |
| Release Date: | 2018 |
| Size: | 6.41 in (inches) |
| Resolution: | 1080 x 2340 pixels |
| Technology: | 6.41 in |
| Main Specs: | 4032 x 3024 pixels, 1920 x 1080 pixels, 30 fps |
| Main Video: | 1920 x 1080 pixels |
| Selfie Specs: | 24.84 MP (megapixels) |
| Capacity: | 3330 mAh |
| Type: | Li-Po |
| Cpu: | 4x 2.2 GHz Kryo 260, 4x 1.84 GHz Kryo 260, Cores: 8 |
| Gpu: | Qualcomm Adreno 512 |
| Ram: | 6 GB, 1866 MHz |
| Storage: | 128 GB |
| Expandable: | microSD, microSDHC, microSDXC |
| Os: | Funtouch 4.5 OS (Android 8.1 Oreo) |
| Os Version: | 8.1 |
| Dimensions: | 75.08 x 157.9 x 7.9 mm |
| Weight: | 156 g |
| Sim: | Nano SIM (Nano-SIM, Nano-SIM / microSD) |
| Wifi: | a, b, g, n, n 5GHz, ac, Dual band, Wi-Fi Hotspot, Wi-Fi Direct |
| Usb: | 2.0, Micro USB |
| Headphone Jack: | Yes |
| Network: | LTE |
| Sensors: | Proximity Light Accelerometer Compass Gyroscope Fingerprint |
| Os Family: | Android |
| Os Launch Version: | 8.1 |
| Os Skin: | Funtouch 4.5 |
