http://www.skype.com/intl/en/allfeatures/skypeaccess/

How Skype Access works
When you’re on the move and need to check your email or get access to the web, Skype Access provided by Boingo* is the easy and great value way to connect.

Simply select any available public access WiFi network (the stronger the signal the better). Skype will automatically pop-up a message if you can connect to this network using your Skype Credit balance.

If you get the pop-up you’re one step from getting web access. And the best part is you pay-per-minute – no longer do you have to pay for all-day access even though you’re only in an airport for a few hours.

You’ll need our latest beta version of Skype for Mac OS X to use Skype Access. It’s currently only available for people with a Mac – but we’re working on a solution for PC too.