FON announces partnership with BT
This article has some of the background.
Done any FONing lately? Most Americans have never heard of the Madrid-based tech startup called FON, but if founder Martin Varsavsky has his way, the name will enter the lexicon the way "Googled" and "Skyped" have. Thanks to a new joint venture with BT Group (BT), announced on Oct. 4, he may have a shot.

There were several blog mentions on this, I took the image from there announcing the birth of BT FON, Congratulations to BT and FON to quote:
Now the Net is abuzz with the news: FON has joined forces with BT to make FON accessible to over 3 million of BT’s Total Broadband customers, creating a potentially unrivalled WiFi community.

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