Crafted to perfection
Discover the incredible craftsmanship behind Mi 4's
stainless steel frame and 5" IPS Full HD display.
Turning steel into art
40 steps and 193 processes
Selecting high-quality stainless steel to press and cut
3 times stronger than aluminum alloy, the stainless steel we selected for the frame is incredibly thin yet robust. Once pressed and cut, positioning holes are punched to hold the steel plate in place during the manufacturing process. Functional holes that appear in the finished design are also added.
After cutting, the steel plate goes through 100-tonne impulse drawing and oil hydraulic press forging to shape the frame of the phone. Remaining residues are scoured off and additional annealing and forging processes take place lasting over 10 hours, to further harden the steel.
The 8-step CNC milling process involves 58 separate operations to shape the frame as well as create the chamfer and 45 speaker holes, each measuring 0.6mm across. It's extremely precise, with a maximum permitted margin of error at 0.03mm.
The chamfer edges are masked before the sides and back of the frame are sandblasted with zirconium microspheres till their surfaces are as smooth as silk.
PVD and AF coating
Sputtering takes place in a vacuum chamber, bonding the atoms of another metal to the steel frame, strengthening it and producing a finish that's highly resistant to fading and scratches. Nano-grade anti-fingerprint (AF) coating makes the frame extremely water repellent.
Laser cutting to complete the frame
A highly focused laser beam vaporizes stainless steel in seconds, separating the frame cleanly from the unneeded metal. Skilled technicians polish the frame, and remove all burrs and residue in the cut-off areas. The frame undergoes multiple quality assurance inspections to ensure it meets rigorous Mi quality standards.
High color saturation
Every inch of the 5" Full HD display is flooded with color - up to 95%
of colors found in the NTSC palette to be exact. Enhanced with a high
1000:1 contrast ratio, it produces even deeper blacks and whiter whites.
See in great detail with 1920x1080 resolution and 441 PPI, set in a thin
2.63mm bezel. Made extra tough with Corning® Concore™ Glass.
13MP Sony/Samsung camera, f/1.8
6-element lens, chroma flash
Take amazing pictures any way you like - in the dark, in motion, with chroma flash, or without. Picture quality is dramatically improved with a Sony IMX 214 stacked sensor, which focuses in just 0.3 seconds. Videos look even better with 4K recording and that’s not all - flip to the front 8MP BSI camera with 80° wide-angle lens for beautiful selfies with an all-natural glow.
Qualcomm Snapdragon 801 2.5GHz processor
Ultimate gaming with Adreno 330 GPU and 3GB RAM
Qualcomm Snapdragon 8X74 AC 801 quad-core 2.5GHz processor and Adreno 330 GPU deliver faster performance and lower power consumption. Its LPDDR3 3GB super high-speed RAM can load large games and apps faster, and play HD video more smoothly.
Back cover with grating pattern design
Intricate lines that are just 0.06mm thin
The all-new In Mold Transfer (IMT) technology involves fusing 9 layers of membranes to form a back cover with a thickness of just 0.8mm – that's just 66% as much as most other phones.
Even better inside - MIUI 6
A living system enhanced by over 100 million active users
Discover new functions, shortcuts, customizations and animations embedded within MIUI 6. Each swipe, pinch and flick is co-developed and upgraded regularly, based on improvement suggestions from some 100 million active MIUI users worldwide.
Surf, stream and game in the fast lane. With a maximum download speed of 150Mbps*, Mi 4 is fast enough for almost any conceivable wireless application.
Speeds are based on theoretical throughput and may vary according to site conditions.
Up to 150Mbps download speed
Up to 50Mbps upload speed