The mobile market is growing continuously, and in the near future, more mobile devices than desktop computers will be used to surf the web. To ensure a user-friendly experience, we must optimize Internet websites for presenting content across the different devices. SharePoint 2013 offers a number of options for optimizing public-facing websites for mobile devices. Depending on your requirements, you can choose one or a combination of several options.
For more information and the remainder of the post, see http://blogs.msdn.com/b/sharepointdev/archive/2013/05/07/optimizing-sharepoint-2013-websites-for-mobile-devices.aspx.