That's how Vivo built their phone Y400 4G

Y400 4G was announced by Vivo in 2025

I/O variants

This model supporting networks 2G, 3G and 1, 3, 5, 7, 8, 20, 28, 38, 40, 41. Performance is HSPA, LTE, GSM / HSPA / LTE.

NFC Yes (market/region dependent), USB USB Type-C 2.0, OTG, WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Bluetooth 5.0, A2DP, LE, Positioning GPS, GLONASS, GALILEO, BDS, QZSS.

Camera

2 lenses insalled on Y400 4G 50 MP, f/1.8, (wide), 1/2.96", PDAF 2 MP, f/2.4, (depth). Some another additional options are Ring-LED flash, panorama, HDR. Video on main camera of Vivo Y400 4G is available with 1080p@30fps modes. This is quite good for instance one of available devices at the moment, OnePlus Watch 3 43mm,

Video camera on selfie camera of the Y400 4G is supported with 1080p@30fps variants.

And how is this beast?

This version runs on processor Octa-core (4x2.8 GHz Cortex-A73 & 4x1.9 GHz Cortex-A53), having chip Qualcomm SM6225 Snapdragon 685 (6 nm), Taking into account Y400 4G rank GPU on this device is Adreno 610.

Storage on Y400 4G is 128GB 8GB RAM, 256GB 8GB RAM, no microSD available, under the hood is Android 15, Funtouch 15.

Vivo Y400 4G body

Vivo made their Y400 4G model with proportion 75.3mmX162.3mmX7.9mm.

Vivo designers with a great deal of effort applied to their new model 2 colors, purple twilight, tropical green (dynamic green) and lastly pearl white.

Vivo Y400 4G display maiden as AMOLED, 120Hz, 1200 nits (HBM), 1800 nits (peak), on that point this phone was ahead from only 20% existing mobile phones in screen size contest, by it's 6.67 inches, 107.4 cm2 (~87.9% screen-to-body ratio) screen with resolution 1080 x 2400 pixels having proportions 20:9, with density 395 PPI.

Additional

Additional features on the model are Circle to Search.

Charging options are 44W wired Reverse wired.

Another important things on phone are sensors, on this model there are Fingerprint (under display, optical), accelerometer, gyro, proximity, compass.