Why do you want to use flowchart in your mobile interface design & screen interface design?
Flow charts have a clear start and end point and quite specific directions on how to achieve those results. It will help a designer to identify errors and ways to correct those mistakes efficiently.
How will it help your users to meet the interactive goals?
Because flow charts deal with a single process at a time and give step-by-step solutions, it is easy to understand and will help the user to meet the interactive goals in a simple and smooth manner.