Is it WiFi Buddy or Virgin Media WiFi you're using?
If it's WiFi Bubbdy, as long as your S3 is on Android 4.3, you should look at upgrading the app to Virgin Media WiFi -
https://play.google.com/store/apps/d...ewifi&hl=en_GB
That should stop the need to sign into the networks the phone connects you to, adds the Hub hotspots to the available networks you can connect to, and all the main networks are secure rather than open.