Design and Build Quality
The Vivo X21 features a refined design with an emphasis on sleek aesthetics and ergonomics. Sporting a glass front protected by Gorilla Glass 3 and a sturdy aluminum back and frame, the X21 exudes a premium feel that is both elegant and durable. The device is designed with a compact form factor, measuring 154.5 x 74.8 x 7.4 mm and weighing 156.2 grams, ensuring it fits comfortably in hand. It also supports a hybrid dual SIM configuration, which offers flexibility for users seeking to balance work and personal communications in one device.
Display
At the forefront of the Vivo X21's design is its stunning display. The device boasts a 6.28-inch Super AMOLED screen, offering vibrant colors and deep contrast ratios. With a resolution of 1080 x 2280 pixels, the display provides a sharp and immersive viewing experience. The screen-to-body ratio of approximately 85.2% ensures minimal bezels, allowing for a maximized display area, ideal for gaming, streaming, and browsing.
Performance
Under the hood, the Vivo X21 runs on a Qualcomm SDM660 Snapdragon 660 chipset, fabricated on a 14nm process, assuring efficient performance across various tasks. The octa-core processor is divided into 4x2.2 GHz Kryo 260 Gold and 4x1.8 GHz Kryo 260 Silver cores, which cater to both power-intensive and energy-efficient needs respectively. The Adreno 512 GPU enhances the graphic performance, making it suitable for gaming and media consumption. The device is equipped with 6GB of RAM, ensuring smooth multitasking and fast app transitions.
Storage Options
The Vivo X21 offers two internal storage variants: 64GB and 128GB, both expandable via a microSDXC card using a shared SIM slot. This ensures that users have ample space to store their apps, media, and documents, with the flexibility of upgrading storage capacity as needed.
Operating System and User Interface
Running on Android 8.1 (Oreo), the Vivo X21 features the Funtouch OS 4, a customized user interface developed by Vivo. This UI adds a layer of intuitive navigation and colorful customization, with various features and optimizations tailored to enhance user experience. While it adheres to the foundational Android design, Funtouch OS introduces unique gestures and animations that set it apart.
Camera Capabilities
The Vivo X21 is equipped with a dual rear camera setup: a primary 12 MP sensor with an f/1.8 aperture, dual pixel PDAF for better autofocus, and a secondary 5 MP depth sensor for enhanced bokeh effects. This combination allows for capturing clear, vibrant, and depth-rich images. The rear camera features include LED flash, HDR, and panorama modes, and it supports video recording at 1080p@30fps.
The front camera offers a 12 MP sensor with an f/2.0 aperture, providing wide-angle capabilities for selfies and video calls. Similar to the rear, it supports 1080p video recording, ensuring clear and detailed outputs.
Audio and Connectivity
The Vivo X21 includes a loudspeaker and retains the 3.5mm headphone jack, catering to traditional audio needs. Connectivity-wise, it supports Wi-Fi 802.11 a/b/g/n/ac, Bluetooth 5.0, and GPS/GLONASS for navigation. However, it does not feature NFC technology. The device is equipped with a microUSB 2.0 port with OTG support for seamless data transfer and connectivity.
Battery Life
Fitted with a non-removable Li-Ion 3200 mAh battery, the Vivo X21 supports 18W fast charging, ensuring quick power replenishment. This battery capacity provides sufficient endurance for daily activities, alongside 18W charging facilitating rapid top-ups throughout the day.
Sensors and Additional Features
The device integrates various sensors including a rear-mounted fingerprint sensor for secure unlocking, an accelerometer, proximity sensor, and a compass for added utility. Despite the absence of some advanced sensors, these components contribute to an enhanced user interaction and experience.
Color Variants and Model Identifiers
The Vivo X21 is available in multiple striking color options: Black, Aurora White, and Ruby Red, offering users a palette to express personal style preferences. It is identified by the model numbers 1725 and X21A, ensuring easy recognition and authenticity in the market.
Pricing and Availability
Launched in March 2018, the Vivo X21 was strategically priced at about 450 EUR, targeting mid-range smartphone users seeking a balance between performance, style, and affordability. Its availability post-launch has ensured widespread access, although pricing may vary based on region and retailer initiatives.
Main Features of vivo X21
- Dual SIM with GSM / CDMA / HSPA / LTE network support
- Super AMOLED display with 6.28 inches, offering ~85.2% screen-to-body ratio
- Protection with Corning Gorilla Glass 3
- Powered by Qualcomm SDM660 Snapdragon 660 with Android 8.1 (Oreo)
- 6GB RAM with options of 64GB or 128GB internal storage
- Dual rear cameras: 12 MP (f/1.8) + 5 MP (f/2.4) and 12 MP front camera
- Supports microSDXC card (uses shared SIM slot)
- Fingerprint sensor (rear-mounted) and various other sensors like accelerometer, proximity, and compass
- Battery: Li-Ion 3200 mAh, non-removable with 18W charging
- Colors available: Black, Aurora White, Ruby Red
Disadvantages of vivo X21
- Uses a hybrid dual SIM slot, which limits simultaneous use of two SIM cards and a microSD card.
- Released with Android 8.1 (Oreo), which is outdated compared to the latest Android versions.
- Lacks NFC support, limiting mobile payment options and certain connectivity features.
- Utilizes a microUSB 2.0 port instead of the more modern USB-C standard.
- Relatively small battery capacity of 3200 mAh, which may not be sufficient for heavy users.
- The charging speed is limited to 18W, which is slower compared to recent fast-charging standards.
- No 4K video recording capability, limited to 1080p@30fps for both main and selfie cameras.
- Priced at about 450 EUR, which might be considered high given the specifications and features.
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