I glad to hear that Fon is still around. Back when they were giving out free AP's I snagged a couple and they were my first foray into hardware hacking. Neat little devices, I always felt a bit guilty about not using them to actually deploy fon hotspots.
A year or two ago they sent an email to all of us with 1st gen FON hardware and said they were retiring it and that we'd have to buy a new one. I didn't.
They never disabled my account - I not get worldwide FON roaming for free forever - yay!
I assume that traffic on that network is always qossed to lowest priority, but I've never used it (I don't use a BT router)