Just to add onto my earlier post...

The wi-free service would work over most data networks.... wifi hotspots, mobile data networks et al.
There was some brief explanation of how the service works on their old webpage... I haven't dug out any archives/cached pages for that.

This page  will probably offer some sneak preview on what was involved.

PS : I had to re-post this since my earlier mail that included some attached screen-shots would have to wait for the moderator's approval (read "to be done next year at minimum" )

Tony.