What do I need to use Skype WiFi in Skype for Mac OS X?
To use Skype WiFi in Skype for Mac OS X, you need:
When you are offline and near a Skype-compatible WiFi hotspot, a message box will appear asking if you want Skype WiFi to connect to the internet. If you don’t see the message box, click Window > Skype WiFi. Make sure to first connect to the hotspot using your Mac's network settings.