Vivo Y400 4G

The Vivo Y400 4G has a slim profile at 7.9 mm thick and weighs 198 g, with overall dimensions of 162.3 mm in height and 75.3 mm in width. One of its more notable design attributes is its IP68 rating, which classifies it as waterproof and means it can withstand submersion to a depth of 2 metres. The device is neither a rugged build nor a foldable design, keeping it within a conventional smartphone form factor.

The Vivo Y400 4G features a 6.67″ OLED/AMOLED touchscreen with a resolution of 1080 x 2400 px and a pixel density of 395 ppi, offering a sharp and vibrant visual experience. It runs at a 120Hz refresh rate and reaches a typical brightness of 1200 nits, with HDR10 support and an Always-On Display mode also on board. HDR10+, Dolby Vision, and a secondary screen are not supported, and the display does not feature branded damage-resistant glass.

The Vivo Y400 4G is powered by the Qualcomm Snapdragon 685 4G, a 6 nm chipset with an octa-core CPU running at 4 x 2.8 GHz and 4 x 1.9 GHz across 8 threads, supported by big.LITTLE technology, NX bit, and TrustZone. It comes with 8 GB of DDR4 RAM at 2133 MHz and 256 GB of eMMC 5.1 internal storage, with a maximum supported memory amount of 16 GB and a peak memory bandwidth of 17 GB/s. Graphics are handled by the integrated Adreno 610 GPU, clocked at 1260 MHz, with support for DirectX 12, OpenGL ES 3.2, and OpenCL 2. The chipset also integrates LTE and supports 64-bit processing, while Geekbench 6 scores land at 473 single-core and 1510 multi-core.

The Vivo Y400 4G has a dual-lens rear camera combining a 50 MP sensor at f/1.8 and a 2 MP sensor at f/2.4, backed by a CMOS sensor, phase-detection autofocus, touch autofocus, and continuous autofocus during video recording, though optical image stabilization and laser autofocus are absent. Manual controls cover exposure, ISO, focus, and white balance, while shooting modes include HDR, burst, panorama, slow-motion video, and timelapse; raw capture and manual shutter speed are not available. Video recording tops out at 1080p at 30 fps, with no support for HDR10 or Dolby Vision recording. A single LED flash is present on the rear, while the front-facing 8 MP camera with an f/2.1 aperture is a single-lens unit with no front flash and is not positioned under the display.

The Vivo Y400 4G runs on Android 15 and includes a broad set of privacy features such as clipboard warnings, location privacy options, camera and microphone access controls, and the ability to block app tracking, though Mail Privacy Protection and cross-site tracking blocking are not present. Customization options cover dark mode, dynamic theming, theme customization, widgets, and customizable notifications, while productivity is supported through split-screen multitasking, Picture-in-Picture, full-page screenshots, a media picker, sharing intents, and the ability to play games while they download. The OS also supports on-device machine learning, offline voice recognition, voice commands, Live Text, app offloading, a child lock, multi-user functionality, phone tracking, and a battery health check. Focus modes, Wi-Fi password sharing, Quick Start, and the ability to function as a PC are not available, and the device does not receive direct OS updates from the vendor.

The Vivo Y400 4G is equipped with a 6000 mAh rechargeable battery that supports 44W fast wired charging, allowing for quicker top-ups compared to standard charging speeds. The battery is non-removable and does not support wireless charging, but a battery level indicator is present to keep track of remaining charge.

The Vivo Y400 4G includes stereo speakers but omits a 3.5 mm headphone jack, so wired headphones require an adapter or USB-C connection. None of the advanced Bluetooth audio codecs are supported, meaning aptX, aptX HD, aptX Adaptive, aptX Lossless, and LDAC are all absent. The device also does not have a built-in radio.

The Vivo Y400 4G supports dual SIM cards and connects via Wi-Fi 4 (802.11n) and Wi-Fi 5 (802.11ac), Bluetooth 5.0, and NFC, while 5G is not supported. It uses a USB Type-C port running USB 2.0 and achieves download speeds of up to 390 MBits/s and upload speeds of up to 150 MBits/s, though there is no HDMI output and no external memory slot. For location and motion sensing, the device includes GPS with Galileo support, a compass, gyroscope, and accelerometer, but lacks a barometer, heart rate monitor, infrared sensor, and ANT+ support. Security is handled through a fingerprint scanner, while 3D facial recognition and an iris scanner are not present. Features such as crash detection, emergency SOS via satellite, a built-in projector, stylus, motion tracking, optical tracking, and DLNA certification are also absent.

The Vivo Y400 4G features a curved display and includes a video light for use during video recording. It does not have a sapphire glass display or an e-paper display.