We've spent some time looking at some of the off-the-shelf methods of making your WordPress site mobile, in the form of plugins and responsive themes. But what do you do if you have a site with a pre-existing theme and you want mobile visitors to see a site which is consistent with that theme? Or if you're frustrated by the fact that the plugins don't display all the content of your site? Or if you just aren't that keen on the available responsive themes?

The answer is to write responsiveness into your theme.