Hi,
You seem to have tried with the webserver to see if you could access your server from other devices, but did you also try to do the same thing with your browser on your phone? That way, you can check if there's network issues.
Also note that the sync server and the review webserver are two different things that run on different ports. So, make sure that you've actually also enabled the sync server. So, when you want to use the Android app instead of a regular browser, double check that your phone is on the same wifi network as your server, and that you're using the ip number and port of the sync server, not of the webserver.
Cheers,
Peter