True FM Radio on an iPhone
So according to varying sources, iPhones (at least 3G, 3GS, and presumably, 4) all have had the capability of receiving FM radio signals; there seems to be some debate but I'm fairly certain that they can. Since Apple never delivered on their rumors to implement a tuner, and if the hardware is there, can it be taken advantage of through hacks? If so, why hasn't this been done yet?
Note: I'm disregarding any comments about streaming radio over 3G/Wifi. I don't care that most stations broadcast live streams, I'm interested in true FM radio because a drive-in movie theater I sometimes visit broadcasts their movies' audio locally on a station, and I want to use my phone in place of my car radio.