vivo X21 UD smartphone runs on Android 8.1 (Oreo); Funtouch 4 operating system. The phone is powered by Octa-core (4x2.2 GHz Kryo 260 & 4x1.8 GHz Kryo 260) processor. It has 128 GB, 6 GB RAM. Internal storage options which can be extended with the help of microSD, up to 256 GB (uses SIM 2 slot). The smartphone has a Super AMOLED providing, Screen-to-Body Ratio of 85.2%. The smartphone is fueled with a 3200 mAh, Non-removable Li-Ion. The main camera of the smartphone consists of a 12 MP, Dual. The sensors include Fingerprint (under display), accelerometer, proximity, compass. Connectivity features in the smartphone include Bluetooth, A-GPS, GLONASS, Wi-Fi, 3.5 mm Jack and more. The vivo X21 UD are available in various colors such as Black, Ruby Red. It measures 154.5 x 74.8 x 7.4 mm and weighs 156.2 g.

Hardware and OS vivo X21 UD
Operating system:	Android 8.1 (Oreo); Funtouch 4
Processor:	Octa-core (4x2.2 GHz Kryo 260 & 4x1.8 GHz Kryo 260)
Chipset:	Qualcomm SDM660 Snapdragon 660 (14 nm)
GPU:	Adreno 512
Internal memory:	128 GB, 6 GB RAM
External memory:	microSD, up to 256 GB (uses SIM 2 slot)
Display vivo X21 UD
Type:	Super AMOLED
Size:	6.28" inc
Resolution:	1080 x 2280 px
Touchscreen:	capacitive touchscreen
Screen-to-Body Ratio:	85.2%
Display area:	98.4 cm²
Display aspect ratio:	19:9 (height:width)
Pixel Density:	402 PPI
Colors:	16M
Connectivity vivo X21 UD
2G Network:	GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G Network:	HSDPA 850 / 900 / 1900 / 2100
4G Network:	LTE band 1(2100), 2(1900), 3(1800), 5(850), 8(900), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500)
Wi-Fi:	Wi-Fi 802.11 a/b/g/n/ac, dual-band, WiFi Direct, hotspot
Network:	GSM / CDMA / HSPA / LTE
SIM card:	Hybrid Dual SIM (Nano-SIM, dual stand-by)
Bluetooth:	5.0, A2DP, LE
Edge:	Yes
GPRS:	Yes
GPS:	Yes, with A-GPS, GLONASS
Speed:	HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps
USB:	microUSB 2.0, USB On-The-Go
Camera vivo X21 UD
Main camera:	12 MP, Dual
Specs:	12 MP, f/1.8, 1/2.55', 1.4µm, dual pixel PDAF -5 MP, f/2.4, depth sensor
Features:	LED flash, HDR, panorama
Video:	1080p@30fps
Selfie camera:	12 MP, Single
Specs:	12 MP, f/2.0
Video:	1080p@30fps
Multimedia vivo X21 UD
3.5 mm Jack:	Yes
Radio:	FM radio
Design vivo X21 UD
Colors:	Black, Ruby Red
Body build:	Front glass, aluminum body
Dimensions:	154.5 x 74.8 x 7.4 mm
Weight:	156.2 g
Battery vivo X21 UD
Battery capacity:	3200 mAh, Non-removable Li-Ion
Other vivo X21 UD
Release date:	2018, March
Sensors:	Fingerprint (under display), accelerometer, proximity, compass