Smart phone, refers to the same as the personal computer, with a separate operating system, independent operating space, users can install their own software, games, navigation and other third-party service providers to provide the program, and through mobile communication network to achieve wireless network Access to the general type of mobile phone.

The use of smart phones [1] has been covered all over the world, but not everyone knows and use because the smart phone has excellent operating system, free to install all kinds of software (only Andrews system), full-screen full touch screen Type of operation sense of these three characteristics, so completely end a few years ago the keyboard phone.

Among them, Google (Google), Apple, Samsung, Nokia, HTC (HTC) the five brands in the world's most widely known, and millet (Mi), Huawei (HUAWEI), Meizu (MEIZU), Lenovo (Lenovo) (ZTE), Coolpad, Oneplus, GIONEE, Sky (K-Touch) and other brands in China.

Extreme conditions test shows that the smart phone will not only heat up due to heat and automatically shut down, but also because of cold and automatically shut down.