Vivo X21 UD mobile was launched in March 2018. The phone comes with a 6.28-inch touchscreen display offering a resolution of 1080×2280 pixels. Vivo X21 UD is powered by an octa-core Qualcomm Snapdragon 660 processor. It comes with 6GB of RAM. The Vivo X21 UD runs Android 8.1 and is powered by a 3200mAh battery.
As far as the cameras are concerned, the Vivo X21 UD on the rear packs 12-megapixel camera. It sports a 12-megapixel camera on the front for selfies.
The Vivo X21 UD runs FunTouch 4.0 is based on Android 8.1 and packs 128GB of inbuilt storage. The Vivo X21 UD is a dual-SIM (GSM and GSM) mobile that accepts Micro-SIM and Micro-SIM cards. The Vivo X21 UD measures 154.50 x 74.80 x 7.40mm (height x width x thickness) and weighs 156.20 grams. It was launched in Ruby Red, Aurora White, and Black colours.
Connectivity options on the Vivo X21 UD include Wi-Fi 802.11 a/b/g/n/ac, GPS, Bluetooth v5.00, USB OTG, 3G, and 4G (with support for Band 40 used by some LTE networks in India). Sensors on the phone include ambient light sensor, gyroscope, proximity sensor, and compass/ magnetometer.
Vivo X21 UD Full Specifications
| Brand | Vivo |
| Model | X21 UD |
| Release date | March 2018 |
| Form factor | Touchscreen |
| Dimensions (mm) | 154.50 x 74.80 x 7.40 |
| Weight (g) | 156.20 |
| Battery capacity (mAh) | 3200 |
| Colours | Ruby Red, Aurora White, Black |
| Screen size (inches) | 6.28 |
| Touchscreen | Yes |
| Resolution | 1080×2280 pixels |
| Processor | octa-core |
| Processor make | Qualcomm Snapdragon 660 |
| RAM | 6GB |
| Internal storage | 128GB |
| Rear camera | 12-megapixel |
| Rear flash | LED |
| Front camera | 12-megapixel |
| Operating system | Android 8.1 |
| Skin | FunTouch 4.0 |
| Wi-Fi | Yes |
| Wi-Fi standards supported | 802.11 a/b/g/n/ac |
| GPS | Yes |
| Bluetooth | Yes, v 5.00 |
| USB OTG | Yes |
| Headphones | 3.5mm |
| Number of SIMs | 2 |
| SIM 1 | |
| SIM Type | Micro-SIM |
| GSM/CDMA | GSM |
| 3G | Yes |
| 4G/ LTE | Yes |
| Supports 4G in India (Band 40) | Yes |
| SIM 2 | |
| SIM Type | Micro-SIM |
| GSM/CDMA | GSM |
| 3G | Yes |
| 4G/ LTE | Yes |
| Supports 4G in India (Band 40) | Yes |
| Compass/ Magnetometer | Yes |
| Proximity sensor | Yes |
| Ambient light sensor | Yes |
| Gyroscope | Yes |
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