This would most likely be a case of a CEC incompatibility working out for the benefit (rather than detriment) of an application.
Anynet+ is Samsung's version of CEC - Consumer Electronics Control - a language that passes via HDMI that allows it to work with other Samsung products. Sony has their own version of CEC (BraviaLink), and if that's an option that you can turn on, it may result in the same benefit as your friend's player.
But on an official note, the two "flavors" of CEC are not compatible with each other, and technically shouldn't be... well.... working together, really.
The other possibility is that you're using component rather than HDMI, which would make a difference too.
I have a friend with a smsung TV and the Anynet+ function auto-tunes to his PS3 automatically, however when i get home and check mine it does not work. For a TV i'm using the LN46A630 and i have an older version of the Playstation 3 system (40GB). I know he has a 50" Samsung but not sure of the model and he has a newer PS3 (slim). Are only the new PS3's compatible or is there a reason why mine does not work? help!!!