On mobile devices, and when using col-xs-12, the link on those divs weren’t working!

First, looks like theres is a order to put those classes

col-xs-12 col-sm-6 col-md-6

But the solution was to change the z-index of col-xs-12 as described here http://stackoverflow.com/questions/27886096/hyperlinks-not-working-on-xs-screens-in-bootstrap-v3-3-1.

.col-xs-12 {
     z-index: 1;
}