You don't need Plex Pass to stream content from your Plex server to your phone. I do it all the time. All you have to do is forward the port (32400? I forget now) the Plex server uses. I have a DynDNS domain that I use to directly access my server, but if you don't want to go through that, you can go to the Plex web page, log in, and it provides a link to your server.