Yellix is a startup focussed on integrating Facebook with your phone's telephony, i.e. when someone calls you, their Facebook avatar and status are automatically popped up on screen, giving you an idea of where they might be or what they're up to. There's a native S60 3rd Edition version for download, the service is free and you can start using it immediately. Bandwidth used is reportedly low, only 3k for each avatar/status pop-up. See below for a hi-res promo video, a bit from the press release and see also their FAQ page.
Read on in the full article.