Mi3 is the fasteest Xiaomi phone so far. It ships with either a brand new 1.8 Ghz quad-core Tegra 4 chip from nVidia or a Qualcomm Snapdragon 800 processor. Other components are equally outstanding: 5-inch IPS display (full HD at 16:9), 13 MP camera with dual-LED flash, and 3050mAh lithium ion polymer battery. It is only 8.1 mm thin, 145 grams light, and houses an alumium-magnesium alloy frame, coated with 3 layers of thermal graphite. It is published on Sep 5th, 2013 in Mainland China, and went on sale on Mar 7th, 2014 in Singapore (only for S$419).
This thread will keep the most important information about the MI3 in one place. Please check this information before posting any question or bug. May be its already posted and you can get immediate and concise info about your problems and questions.
Specifications & Buying Guide
Mi3 WCDMA Version Specification
Chipset: Qualcomm MSM8274AB Snapdragon 800
Network: WCDMA (2G Network 850/900/1800/1900; 3G Network 850/900/1900/2100)
Display: 5.0 inches 1080*1920 pixels
CPU: Quad-core 2.3 GHz Krait 400
Carema: 13MPixel Sony Exmor RS/Front 2 MPixel
Battry: 3050mAh Non User-Interchangeable
RAM: 2GBROM: 16GB/64GB
SIM: Mini SIM
Click for more specs. For international users who want to use 3G should use WCDMAversion.
Always buy Xiaomi products from the offical websites and channels.
How to buy Xiaomi products & identify fake ones. Official tutorial on how to buy Xiaomi products.
Xiaomi Mi3 Buyers Guide. A nice comparison of Fake and Original Mi3 phone by @gsdivaMi
More discussion on fake Xiaomi Mi3:  
Singapore Mi3 Buyer Guide. Mi3 buying guide for Singapore users.
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