vivo X21 UD
$0
Overview
vivo X21 UD is a budget Android smartphone released in 2018 with a 6.28-inch Super AMOLED, Snapdragon 660 chipset, 12 main camera, and 3200 mAh battery.
The device runs Funtouch OS with features like ZEISS partnership. Priced at $0, it targets users seeking budget performance.
Specifications of vivo X21 UD
The display of vivo X21 UD measures 6.28 inches with Super AMOLED technology. Peak brightness reaches 600 nits for excellent outdoor visibility. The screen renders at 1080x2280 pixels resolution.
The camera system of vivo X21 UD features 2 rear cameras: 12 main, 5MP ultrawide, 5MP telephoto. Optical zoom reaches 2x for detailed distant shots. Video recording supports up to 1080p.
The battery of vivo X21 UD has 3200mAh capacity with 18 wired charging. A full charge takes approximately 120 min minutes.
The performance of vivo X21 UD is powered by the Snapdragon 660 chipset with Adreno 512 GPU.
The memory of vivo X21 UD offers 6GB RAM with 128GB storage options. RAM uses LPDDR4X technology. Storage is 128GB 6GB RAM.
The connectivity of vivo X21 UD includes Wi-Fi Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, and Bluetooth 5.0.
The build of vivo X21 UD weighs 156.2g with Aluminum frame and Glass back. Dimensions measure 154.5 x 74.8 x 7.4 mm.
The software of vivo X21 UD runs Android 8.1 (Oreo), Funtouch 4 with Funtouch. Software support extends 2 years through 2028.
Compare vivo X21 UD
Frequently Asked Questions about vivo X21 UD
vivo X21 UD has a 12 camera suitable for casual photography. For professional photography, consider phones with higher-resolution sensors.
vivo X21 UD with Snapdragon 660 can handle casual gaming. For intensive gaming, consider phones with flagship chipsets.
vivo X21 UD receives 2 years of updates through 2028. Consider this when planning long-term device usage.
vivo X21 UD has a 3200mAh battery. Battery life varies based on usage patterns.
vivo X21 UD at $0 is a budget device. It's worth buying if you prioritize affordability over premium features.
vivo X21 UD supports 18 wired charging with full charge in approximately 120 min minutes.
vivo X21 UD is available in 128GB storage options. Storage is not expandable, so choose your capacity based on your needs.
vivo X21 UD has a 6.28-inch Super AMOLED with 60Hz refresh rate and 600 nits peak brightness. HDR support includes No.
vivo X21 UD in Category Rankings
See how vivo X21 UD ranks in these categories:
Verdict
The vivo X21 UD delivers practical value for users prioritizing affordability over premium features. Pick this phone for essential smartphone functionality, if you prioritize affordability while still needing core features.
Key Specifications
Display
6.28"
Main Camera
12
Chipset
Snapdragon 660
Full Specifications
Network
| Technology | GSM / CDMA / HSPA / LTE |
| 2G Bands | GSM / |
| 3G Bands | HSDPA 850 / 900 / 1900 / 2100 |
| 4G LTE Bands | LTE |
| 5G Sub-6 Bands | N/A |
| 5G mmWave Bands | N/A |
| Speed | N/A |
| Carrier Aggregation | 4x4 MIMO |
| SIM | Nano-SIM |
| Dual SIM Mode | Dual SIM |
| eSIM Support | |
| VoLTE Support | N/A |
| VoWiFi | N/A |
| NR CA Support | N/A |
Launch
| Announced | 2018 |
| Status | Discontinued |
| Availability | N/A |
| Model Variants | N/A |
| Launch Price | N/A |
Body & Design
| Dimensions (mm) | 154.5 x 74.8 x 7.4 mm |
| Weight (g) | 156.2 |
| Build Materials | Glass front (Gorilla Glass 3), aluminum back, aluminum frame |
| Frame | Aluminum |
| Back Finish | Glass |
| Colors | ["Black", "Ruby Red"] |
| IP Rating | N/A |
| Rugged Certifications | N/A |
| Ingress Gaskets | N/A |
| Form Factor | Bar |
| Hinge Type | N/A |
| Folded Dimensions | N/A |
| Thermal Solution | Graphite Sheet |
| Notification/Alert | |
| Haptics | Basic Vibration |
Display
| Panel Type | Super AMOLED |
| Size (inches) | 6.28 |
| Resolution (px) | 1080x2280 pixels |
| Aspect Ratio | 9:19 |
| Pixel Density (ppi) | 402 |
| Screen-to-body Ratio (%) | 85.2 |
| Refresh Rate (Hz) | 60 |
| Adaptive Refresh Rate | |
| Touch Sampling Rate (Hz) | 120 |
| Peak Brightness (nits) | 600 |
| HDR Standards | |
| Color Gamut | sRGB |
| Color Depth | 24 |
| PWM Dimming (Hz) | 240 |
| Glass Protection | Corning Gorilla Glass 3 |
| Oleophobic Coating | N/A |
| Curvature | Flat |
| Always-on Display | |
| Display Driver IC | N/A |
| Cover Display | Gorilla Glass |
Platform (SoC)
| OS at Launch | Android 8.1 (Oreo), Funtouch 4 |
| Update Policy | 2 years |
| Chipset | Snapdragon 660 |
| CPU | Octa-core (4x2.2 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver) |
| GPU | Adreno 512 |
| NPU/AI TOPs | N/A |
| ISP Features | Dual Pixel PDAF, HDR |
| Modem | Snapdragon X12 LTE |
| Wi-Fi/Bluetooth Chip | N/A |
| Throttling Behavior | N/A |
| Geekbench Single-Core | N/A |
| Geekbench Multi-Core | N/A |
| AnTuTu Score | N/A |
| 3DMark Scores | N/A |
Memory & Storage
| RAM | 6GB |
| RAM Type | LPDDR4X |
| Storage | 128GB |
| Storage Type | 128GB 6GB RAM |
| Storage Speed | UFS 2.1 |
| Expandable Storage | microSDXC (uses shared SIM slot) |
| Slot Type | microSD |
| USB OTG | |
| Filesystem Encryption | F2FS |
Main Camera System
| Rear Cameras | 2 |
| Main Sensor | 12 |
| Main Sensor Size | 1/2.55" |
| Main Sensor Model | Sony IMX363 |
| Main Lens | f/1.8, 26mm |
| OIS | |
| Autofocus | PDAF |
| Pixel Binning | |
| Ultrawide | 5MP, FOV: 120° |
| Telephoto | 5MP, 2x optical zoom |
| Macro | 2 |
| Depth/ToF/LiDAR | |
| Flicker/Color Sensors | N/A |
| Flash | Dual LED |
| Video Resolution | 1080p |
| HDR/Dolby Vision Video | |
| Video Codecs | H.264, H.265 |
| Slow Motion | 720p@240fps |
| Video Stabilization | EIS |
| Night Mode Features | |
| RAW/Pro Controls | N/A |
Selfie Camera
| Resolution | 12 |
| Sensor Size | 1/3.1" |
| Aperture | f/2.0 |
| AF/OIS | |
| Secondary Front Cam | |
| Front Flash | Screen flash |
| Video | 1080p@30fps |
| HDR/Dolby Vision | N/A |
| Face Unlock | 3D Structured Light |
Audio
| Loudspeakers | |
| 3.5mm Jack | |
| Hi-Res Audio | |
| Spatial Audio / Dolby Atmos | |
| Microphones | 2 |
| Bluetooth Codecs | aptX, aptX HD, LDAC |
| DAC/Amp | Built-in DAC |
Connectivity
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct |
| Wi-Fi Features | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct |
| Bluetooth | 5.0 |
| NFC | |
| IR Blaster | |
| UWB | N/A |
| Positioning | GPS, GLONASS |
| Dual-Band GNSS | |
| FM Radio | |
| USB | Micro-USB |
| Display Out | |
| eSIM Capacity |
Sensors
| Fingerprint Sensor | Fingerprint (Under Display, Optical) |
| 3D Face ID | N/A |
| Accelerometer | |
| Gyroscope | |
| Magnetometer | |
| Proximity Sensor | |
| Ambient Light | |
| Barometer | |
| Thermo/Hygrometer | N/A |
| UV Sensor | N/A |
| Hall Sensor | |
| Color Temp Sensor | |
| Health Sensors | N/A |
| Satellite SOS |
Battery & Charging
| Capacity (mAh) | 3200 |
| Type | Li-Ion |
| Removable | |
| Endurance Rating | N/A |
| Wired Charging | 18 |
| Wired Standard | Qualcomm Quick Charge 4 |
| 0-50% Time (mins) | 65 min |
| Full Charge Time | 120 min |
| Wireless Charging | N/A |
| Wireless Standard | N/A |
| Reverse Wireless | N/A |
| Reverse Wired | |
| Charger in Box | 18W charger |
| Battery Health Features | Basic charging optimization |
Software
| OS at Launch | Android 8.1 (Oreo), Funtouch 4 |
| Update Window | 2 years |
| UI Skin / Launcher | Funtouch |
| Feature Drops | N/A |
| App Cloning | N/A |
| Game Mode | |
| Privacy Features | App Lock, Private Space |
| Accessibility | Basic Android accessibility |
| Satellite Messaging UI |
Miscellaneous
| In-Box Contents | Phone, charger, cable, case, manual |
| Recycled Materials (%) | N/A |
| Repairability Score | N/A |
| Warranty | N/A |
Reviews & Ratings
186 ratings
Showing 3 of 186 reviews
Alex R.
2 weeks ago
Absolutely love the camera on this phone! The zoom is incredible and the photos are so crisp. Battery life is also a huge plus.
Ben C.
1 month ago
Great performance and beautiful display. My only complaint is that it feels a bit heavy, but you get used to it. Solid phone overall.
Chloe D.
3 months ago
The best phone I've ever owned. It's fast, the software is clean, and the build quality is top-notch. Highly recommend!