In more general terms, I should mention that some major WordPress sites like my local newspaper's, use themes or plugins that automatically create what appears to be a parallel web site for their mobile visitors, typically in the subdirectory /m/.
For Themes, there is a whole concept called Responsive that deals with this.
For plugins, this Search might help find the most popular ones, though you get a lot of false positives:
http://wordpress.org/plugins/search.php?q=mobile&sort=popular
Here are two plugins I found that seem to deal with the subject:
http://wordpress.org/plugins/wptouch/
http://wordpress.org/plugins/wordpress-mobile-pack/
Like I say, not something I know much about. I just use the TwentyFourteen theme and find it does enough for my mobile users.