Vivo X21 UD smartphone was launched in March 2018. The phone comes with a 6.28-inch touchscreen display with a resolution of 1080 pixels by 2280 pixels.

The Vivo X21 UD is powered by octa-core processor and it comes with 6GB of RAM. The phone packs 128GB of internal storage. As far as the cameras are concerned, the Vivo X21 UD packs a 12-megapixel primary camera on the rear and a 12-megapixel front shooter for selfies.

The Vivo X21 UD runs Android 8.1 and is powered by a 3200mAh. It measures 154.50 x 74.80 x 7.40 (height x width x thickness) and weighs 156.20 grams.

The Vivo X21 UD is a Dual-SIM (GSM and GSM) smartphone that accepts Micro-SIM and Micro-SIM. Connectivity options include Wi-Fi, GPS, Bluetooth, USB OTG, 3G and 4G (with support for Band 40 used by some LTE networks in India). Sensors on the phone include Compass/ Magnetometer, Proximity sensor, Ambient light sensor and Gyroscope.