Chinese phone has a bad design, specially in china. Android phone like Xiaomi in china, the build quality is bad. They have no core skills. Lei Jun spend more of his time talking and selling.
They sell their phone cheap (Android phone in China) including Xiaomi. So how are they going to make back the money when they sell their hardware cheap to consumer ? They let in a lot of advertising and advertisment so that it make more money out from consumer. This is one of the reason why the phone overheat all the time. Too much advertising has been running on your backend of your phone.
This is also one of the many reasons why Apple sell so out despite their function had been greatly reduced by Chinese govt (face time). Plus according to many users their apple phone can used for at least 4 years to 6 years before they are being forces to change. For an Android phone in china, 2 years you need to change cos there will be so many advertisment that make your droid phone slow and drain your energy off. Plus if you are going to upgrade your old apple phone to a newer version , there a much higher residual value left.