It's back in 1989 where it belongs
That's funny.... BUT I haven't been able to find it on my AT&T GS2 then I remembered with my last AT&T Phone(Samsung Focus) it didn't have a "free' FM Transmitter either and reason was AT&T was pushing their FM Radio app which I believe used data.. Personally I like Pandora but that also uses up data so I only use it with WiFi and AT&T Network switched off so not to use up my data plan..
It's a shame they try and get you everyday possible..