We do not officially support Windows Phone at this time. However it supports L2TP VPNs, which we do have a couple of servers.
You could set it up to use our L2TP server, the details of which are on our website and installation guides for Android / iOS should be fairly similar. However, we do not have a guide at this time and thus you may need to do configuration on your own. We'll help as much as we can though!