vivo X21 UD phone was announced in 2018, March by vivo and was launched in March, 2018. The vivo X21 UD phone has 154.5 x 74.8 x 7.4 mm (6.08 x 2.94 x 0.29 in) (height x width x thickness) dimensions with weight 156.2 g (5.50 oz) grams. It comes in Black and Ruby Red colors.
The operating system which runs on the phone is Android 8.1 (Oreo), Funtouch 4. The display size of the phone is 6.28 inches, 98.4 cm2 (~85.2% screen-to-body ratio) with resolution of 1080 x 2280 pixels, 19:9 ratio (~402 ppi density) pixels. The network technology of the phone is GSM / CDMA / HSPA / LTE with 2G bands GSM 850 / 900 / 1800 / 1900 – SIM 1 & SIM 2, 3G bands HSDPA 850 / 900 / 1900 / 2100 and 4G bands 1, 2, 3, 5, 8, 34, 38, 39, 40, 41.
The phone has rear camera with specs, 12 MP, f/1.8, 1/2.55″, 1.4µm, dual pixel PDAF 5 MP, f/2.4, (depth) and the front camera with specs , 12 MP, f/2.0, (wide), 1/2.8″, 1.28µm. The camera is featured with LED flash, HDR, panorama. The phone is powered with a battery of 3200 mAh capacity, Octa-core (4×2.2 GHz Kryo 260 Gold & 4×1.8 GHz Kryo 260 Silver) CPU and Adreno 512 GPU. As for as the RAM and the ROM of the vivo X21 UD phone are concerned, it comes with 128GB 6GB RAM. The list of sensors, price and many other specifications are given below.