Smart phones, like personal computers, have independent operating systems, most of which are large-screen machines, touch capacitive screens, and some are resistive screens, which are powerful and practical. Users can install programs provided by third-party service providers, including games, which can continuously expand the functions of mobile phones and realize wireless network access through mobile communication networks.
Generally speaking, it is a simple formula of "1+1=" PDA+mobile phone = smart phone ". Broadly speaking, smart phone not only has the function of talking on mobile phone, but also has most functions of PDA, especially personal information management based on wireless data communication, browser and email functions.