Vivo X21 UD (2018)
The manufacturer offers this phone with a 6.28 inch Super AMOLED display, a Qualcomm Snapdragon 660 MSM8976 Plus SoC, and 6 GB of RAM.
Discover its hidden sides, both good and bad!
Table of Contents
- Vivo X21 UD specifications
- Weight, dimensions, colors
- System, chipset, performance
- Display type, size, resolution
- Memory, storage
- Cameras, flash
- Connectivity, network, wireless
- Battery type, capacity, charger
- Features, sensors, specials
- Verdict, pros and cons
This article shares our personal experiences and thoughts about using the Vivo X21 UD smartphone. We hope to offer helpful insights to others interested in this device.
Vivo X21 UD specifications
| Brand | Vivo |
|---|---|
| Name | X21 UD |
| Model | X21UD |
| Release date | 2018 |
Weight, dimensions, colors
| Weight | 5.5 oz |
|---|---|
| Dimensions | 6.08 x 2.94 x 0.29 inch |
| Colors | black, red, white |
| SIM type | Nano SIM |
The weight of Vivo X21 UD is about 5.5 oz with battery. This is average for smartphones of the same size. Smartphones use a Nano SIM as a small chipcard for a subscriber identity module (SIM).
System, chipset, performance
| OS version | Android OS v8.1 (Oreo) |
|---|---|
| SoC | Qualcomm Snapdragon 660 MSM8976 Plus |
| CPU | Quad-core, Dual-core 2.2 GHz Kryo, Dual-core 1.84 GHz Kryo |
| GPU | Adreno 512 |
The Vivo X21 UD comes with Android OS v8.1 (Oreo) out of the box. Android is a mobile operating system. Google built it using a modified version of the Linux kernel. They also used other open-source software. The mid-range CPU can deliver fast, efficient performance for many tasks. Qualcomm's Snapdragon processors work with Adreno GPUs. The processors are designed for the GPUs.
Display type, size, resolution
| Display type | Super AMOLED |
|---|---|
| Screen size | 6.28 inch |
| Resolution | 1080 x 2280 px |
| Multitouch support | yes |
The 6.28 inch phone comes with AMOLED display. Smartphones use the AMOLED, which is a type of OLED display. The 6.28 inch display should be big enough for our needs. It will make viewing comfortable. This is true whether we're reading, browsing, or watching. The size of the screen is measured diagonally, from corner to corner.
Memory, storage
| RAM | 6 GB |
|---|---|
| Internal storage | 64 GB |
| Memory card slot | microSD |
The Vivo X21 UD comes with 6 GB of RAM, which is considered to be sufficient for most users' needs. More RAM lets us keep more apps and processes open in the background. This keeps the device from slowing down. 64 GB of storage is usually seen as good for a smartphone. It should be enough for most users. We can expand the internal storage (64 GB) with a compatible microSD card.
Cameras, flash
| Main camera | 12 + 5 MP, 4032 x 3024 px, autofocus, optical image stabilization |
|---|---|
| Flash | LED |
| Selfie camera | 12 MP |
Using multiple cameras has advantages. They provide more versatility and creative possibilities. They let us capture a wider range of subjects. The main camera of X21 UD has optical image stabilization (OIS). It counters camera shake.
Connectivity, network, wireless
| GSM 2G bands | 850 / 900 / 1800 / 1900 |
|---|---|
| Network coverage | 2G / 3G / 4G |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac |
| Bluetooth | v5.0, A2DP |
| GPS | A-GPS, GLONASS |
| NFC | no |
| FM radio | no |
| USB | microUSB 2.0 |
| Headphone | 3.5 mm jack |
The 4G provides faster data transfer speeds compared to previous generations. This phone like all modern smartphones, is capable of connecting to Wi-Fi networks. The X21 UD smartphone is capable of connecting to Bluetooth devices. This phone has a built-in GPS. The phone isn't NFC (Near Field Communication) capable. NFC is not essential for basic phone functionality, but it can be useful. The 3.5 mm headphone jack allows us to connect wired headphones or earphones to the device.
Battery type, capacity, charger
| Type | Li-Po 3200 mAh, non-removable |
|---|
The Li-Po 3200 mAh, non-removable battery gives the smartphone a good battery backup. The lithium polymer (Li-Po) battery is a light-weight, rechargeable battery. The battery of X21 UD isn't removable without voiding the warranty.
Features, sensors, specials
| Sensors | accelerometer, compass, fingerprint, gyroscope, light, proximity |
|---|---|
| Specials | Dual SIM, Fast charging |
Today, smartphones come with many sensors. They help make the user experience better. The accelerometer is a sensor. It measures the tilting motion and orientation of the phone. The X21 UD phone has a fingerprint scanner. The light sensor detects the level of light in the environment. Dual SIM is great for businesses. They want to give staff a device with separate numbers and bills for personal and business use. The fast charging technology comes in handy when we need quick juice on our device.
Verdict, pros and cons
Every phone has its strengths and weaknesses, and this Vivo phone is no exception. As with any device, there are aspects that shine and others that fall short. By examining both sides, we can paint a complete picture of what this phone has to offer. Let's explore its standout features and areas for improvement. Remember, this is just my opinion, and yours might be different.
Pros
- Super AMOLED display
- appropriate screen size
- adequate memory
- microSD slot
- multicamera setup
- optical image stabilization (OIS)
- Dual SIM support
Cons
- no 5G support
- no NFC feature
- no Type-C USB port
- low-capacity battery
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I'm Lucas Bradley, the founder of the Phone42.com site. I love technology, especially smartphones, and I've been working with tech stuff for more than 20 years. This means I've seen a lot of changes and have learned a bunch about what makes a good phone. On Phone42.com, I look at all kinds of phones. They can be from big, well-known companies or new ones trying to make their mark. I want to help people understand what's new and cool in the world of smartphones, in a way that's easy to get.