For many groups on campus, Google Analytics is a great tool to help you tweak your navigation and design. What about using it to show how people are accessing your site from a mobile perspective?
Check out this Google Analytics dashboard that you can add to your account that will help you get a better understanding of what devices are visiting your website.
If you are wondering whether or not it is time to go responsive (the answer is yes you should by the way) then why not let your site analytics answer the question for you. We have built a ready to use google analytics dashboard that lets you see how your site is stacking up across desktop mobile and tablets.