Why do you want to use flowchart in your mobile interface design & screen interface design ?
How will it help your users to meet the interactive goals ?
A flowchart can immediately gives the reader the general idea of what is going on with just a few simple words. Hence it is way more attractive than when you have a whole paragraph of words just to tell you a simple message, when you can present it with a simple symbol or image and a few letters and it will do the magic for you.
It also clearly signifies what is next or even have multiple choices that leads to different conclusions. It is straight to the point without any other fuss.
By integrating the system of a flowchart into our mobile & screen interface design, users will know what is next and what comes next vice versa. It served the whole purpose for us to convey our message quickly, shortly & clearly.