title: different storyboard based on phone model
body: <p>I'm working on an app in swift which needs to run on all iPhone models from 4S onwards but I want to to be laid out very differently on 4S, so I want to direct the app to load into a completely different storyboard on 4S.
  I know this can be done for iPad in the info tab but setting the Main storyboard file base name (iPad) but I cannot find a way to do this for different iPhone models.
  Any help would be greatly appreciated </p>