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vivo X21 UD
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Phone Insight
Full Specifications September 3, 2026
vivo X21 UD Android 8.0
vivo · 2018

vivo X21 UD

vivo X21 UD Android smartphone. Announced Mar 2018. Features 6.28″ display, Snapdragon 660 chipset, Dual: 12 MP (f/1.8, 1/2.5″, 1.4µm, dual pixel PDAF) + 5 MP primary camera, 12 MP front camera, 3200 mAh battery, 128 GB storage, 6 GB RAM, Corning Gorilla Glass 3.

Display 6.28"
Chipset Snapdragon 660
RAM 6 GB
Storage 128GB storage, microSDXC
Camera 12 MP
Battery 3200 mAh
OS Android 8.1, Funtouch 4
Build 156.2g, 7.4mm thickness

Launch

Announced 2018, March. Released 2018, March
Status Discontinued

Platform

OS Android 8.1 (Oreo), Funtouch 4
Chipset Qualcomm SDM660 Snapdragon 660 (14 nm)
CPU Octa-core (4x2.2 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver)
GPU Adreno 512

Display

Type Super AMOLED
Size 6.28 inches, 98.4 cm 2 (~85.2% screen-to-body ratio)
Resolution 1080 x 2280 pixels, 19:9 ratio (~402 ppi density)
Protection Corning Gorilla Glass 3

Memory

Card slot microSDXC (uses shared SIM slot)
Internal 128GB 6GB RAM
memoryother eMMC 5.1

Main Camera

Dual 12 MP, f/1.8, 1/2.55", 1.4µm, dual pixel PDAF Auxiliary lens
Features LED flash, HDR, panorama
Video 1080p@30fps

Selfie camera

Single 12 MP, f/2.0, (wide), 1/2.8", 1.28µm
Video 1080p@30fps

Body

Dimensions 154.5 x 74.8 x 7.4 mm (6.08 x 2.94 x 0.29 in)
Weight 156.2 g (5.50 oz)
Build Glass front (Gorilla Glass 3), aluminum back, aluminum frame
SIM Nano-SIM + Nano-SIM

Battery

Type Li-Ion 3200 mAh, non-removable
Charging 18W wired

Sound

Loudspeaker Yes
3.5mm jack Yes
optionalother 32-bit/192kHz Hi-Res audio

Comms

WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Bluetooth 5.0, A2DP, LE
Positioning GPS, GLONASS
NFC No
Radio FM radio
USB microUSB 2.0, OTG

Network

Technology GSM / CDMA / HSPA / LTE
2G bands GSM 850 / 900 / 1800 / 1900
3G bands HSDPA 850 / 900 / 1900 / 2100
4G bands 1, 2, 3, 5, 8, 34, 38, 39, 40, 41
Speed HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps

Features

Sensors Fingerprint (under display, optical), accelerometer, proximity, compass

Misc

Colors Black, Ruby Red
Models X21UD A
Phone Insight phoneinsight.org/ Printed September 3, 2026

For live pricing, photos, and comparisons, visit phoneinsight.org/phones/vivo-x21-ud/

In depth

Full specifications

Announced 2018, March. Released 2018, March
Status Discontinued
OS Android 8.1 (Oreo), Funtouch 4
Chipset Qualcomm SDM660 Snapdragon 660 (14 nm)
CPU Octa-core (4x2.2 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver)
GPU Adreno 512
Type Super AMOLED
Size 6.28 inches, 98.4 cm 2 (~85.2% screen-to-body ratio)
Resolution 1080 x 2280 pixels, 19:9 ratio (~402 ppi density)
Protection Corning Gorilla Glass 3
Card slot microSDXC (uses shared SIM slot)
Internal 128GB 6GB RAM
memoryother eMMC 5.1
Dual 12 MP, f/1.8, 1/2.55", 1.4µm, dual pixel PDAF Auxiliary lens
Features LED flash, HDR, panorama
Video 1080p@30fps
Single 12 MP, f/2.0, (wide), 1/2.8", 1.28µm
Video 1080p@30fps
Dimensions 154.5 x 74.8 x 7.4 mm (6.08 x 2.94 x 0.29 in)
Weight 156.2 g (5.50 oz)
Build Glass front (Gorilla Glass 3), aluminum back, aluminum frame
SIM Nano-SIM + Nano-SIM
Type Li-Ion 3200 mAh, non-removable
Charging 18W wired
Loudspeaker Yes
3.5mm jack Yes
optionalother 32-bit/192kHz Hi-Res audio
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Bluetooth 5.0, A2DP, LE
Positioning GPS, GLONASS
NFC No
Radio FM radio
USB microUSB 2.0, OTG
Technology GSM / CDMA / HSPA / LTE
2G bands GSM 850 / 900 / 1800 / 1900
3G bands HSDPA 850 / 900 / 1900 / 2100
4G bands 1, 2, 3, 5, 8, 34, 38, 39, 40, 41
Speed HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps
Sensors Fingerprint (under display, optical), accelerometer, proximity, compass
Colors Black, Ruby Red
Models X21UD A
Price About 550 EUR
PhoneInsight Benchmark
43.1/100
Mid-range

A specs-derived composite score, not a lab benchmark -- useful for ranking and comparison.

Processor 37.2
Display 66
Camera 48
Battery 56.7
797,018 hitsTotal views
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