Are you sure the site wasn't just loading? It does have a (somewhat) large initial payload (~1mb). If your phone's connection is a little slow it might take a bit to load.
What browser did you observe the behavior in? Safari?
We haven't really optimized it for mobile yet (for example, the charts won't show up on mobile just yet). However, it should work on mobile phones in general.
Can you give me the specs on browser/phone etc. for which it is not working for you (if it really is not working)?