I guess that the topic probably doesn't concern you any longer, but I just thought that I would try to post what solved the same problem for me today.
Try downloading Real VNC (http://www.realvnc.com/products/enterprise/index.html). Even though it asks you to register, you can download without filling the info in. You only need the viewer, which is free in the app folder.
I didn't have to do anything, but just plug in the i.p. address of my iPhone and it works without any problems.
Hope this helps to anyone who googles the problem.