Carl and Richard talk to Chris Hardy from Xamarin about his experience building an application for Windows Phone and then migrating it to iPhone and Android. Chris talks about his Days Until Xmas app he first built for Windows Phone. The conversation digs into the differences in building UI between the different phones (it's harder than you think!) and what code can actually be shared between projects. Chris has put the iOS version of the app up on GitHub so you can take it out for a spin!