Isn't it time to start moving to responsive mediawiki templates (https://en.wikipedia.org/wiki/Responsive_web_design), rather than having a separate mobile interface/URL?
For a practical example, see the BBC News website (http://www.bbc.co.uk/news), which is the same website on all devices, it just rescales the content/navigation/layout to suit the device. (Try resizing your web browser on your computer to the size of a mobile web browser to see what I mean.)