Body & Design

The phone measures approximately 163.2 mm in height, 78.0 mm in width, and 7.50 mm in thickness, with a weight around 194 g — making it relatively slim and light given its feature set.
Build materials include a front protected by Corning® Gorilla® Glass 7i, a refined back panel with designer touches, and top-tier ingress protection rated at IP68 in many markets. The finish is premium, with colour options such as Black, Grey, and Mocha Gold. The camera island is square-chamfered and includes prominent Leica branding for the optics.

Display

The display is a 6.83-inch AMOLED panel with a resolution of 2772 × 1280 pixels (~447 ppi). It offers a refresh rate of 120 Hz, a touch sampling rate up to 480 Hz (with instantaneous sampling up to 2560 Hz in game mode), and a peak brightness reaching 3200 nits (on 25% APL). The panel supports HDR10+ and Dolby Vision, covers DCI-P3 with 12-bit colour depth (68 billion colours), and is TÜV Rheinland certified for low blue-light, flicker-free and circadian-friendly viewing.

Performance (Hardware & Software)

At its core the device uses the MediaTek Dimensity 8400-Ultra chipset built on a 4 nm process. The CPU configuration is 1× Cortex-A725 up to ~3.25GHz, 3× Cortex-A725 up to ~3.0GHz, and 4× Cortex-A725 up to ~2.1GHz, paired with a Mali-G720 GPU and integrated NPU for AI tasks.
With 12 GB of LPDDR5X RAM and 512 GB of UFS 4.1 storage, the phone is well-equipped for demanding apps, gaming, media editing, and future-proofing. The software platform is Android 15 with HyperOS, offering modern features, system-level optimisations and multi-year update support.

Memory & Storage

This variant offers 512 GB internal storage, delivering ample capacity for high-resolution photos, 4K video, large app libraries and much more. There is no microSD slot, so all storage is built-in. The RAM amount (12 GB) ensures smooth multitasking and headroom for heavy workflows, and virtual RAM extension is supported in many markets for further multitasking performance.

Camera System

Rear camera setup includes:

• 50 MP main sensor with Leica Summilux optics, light-fusion 800 sensor (2.0 µm 4-in-1 super-pixel) and f/1.7–2.2 aperture (depending on lighting).

• 50 MP telephoto lens with equivalent focal length around 46 mm (1x–2x optical zoom) with Leica lens and dual-OIS.

• 12 MP ultra-wide lens equivalent to ~15mm and f/2.2 aperture, capturing 120° field of view.
  Photography supports Leica photographic styles (Authentic, Vibrant), Leica watermark, specialised filters, and AI enhancements such as ProFocus (motion tracking), Lightning Burst and time-lapse. Video recording capabilities include 4K @ 30/60 fps, 1080p at multiple frame-rates including 120fps, 240fps and up to 960fps slow-motion. Front camera is 32 MP for selfies and video calls.

Battery & Charging

The battery is a 5,500 mAh (typical) dual-cell design with efficient power management. Charging is supported via 67 W HyperCharge (wired) in many regions. Thanks to the efficient chipset and cooling system (“3D IceLoop” dual-cell architecture) sustained performance and good thermal behaviour are achieved.

Connectivity & Features

• Dual-SIM (Nano + Nano) with 5G support in many regions (depending on variant).

• Wi-Fi 6E / Wi-Fi 7 support (depending on region), Bluetooth version 5.x, NFC in many markets.

• USB-C port (OTG support).

• Stereo speakers with Dolby Atmos support.

• Under-display optical fingerprint reader, face unlock.

• Ingress protection rated at IP68 for dust and water resistance.

• Additional features include IR blaster, advanced cooling (3D IceLoop system), Leica imaging signature, satellite-voice features (region-dependent), and AI-powered Smart Features via HyperOS.

Summary

The Xiaomi 15T (12 GB + 512 GB) hits a strong balance of premium features at a more accessible cost: large high-quality display, flagship-class camera hardware with Leica optics, high-speed charging, generous memory/storage, and long-term software support. While it may lack wireless charging (in many markets) or ultra-premium materials seen in ultra-flagships, for its price point it offers exceptional value.