N72 is a smart phone that can be installed with all kinds of software to expand the functions of the mobile phone (it is best not to install some impractical and unsafe software, and the mobile phone will slow down if the software is installed too much). Although ordinary smart phones can also be installed on mobile phones, most of them are JAVA. SIS software is more stable and powerful than JAVA, and it can run multiple programs at the same time in the background like a computer, and switch at any time.