Apps Using Android mobile's inbuilt radio transmitter

[you]

There are certain android apps availible such as Quick FM Transmitter which can stream audio stored on my phone using FM signals.But most of the Android phones do not come with any inbuilt FM transmitter and hence such apps do not work on them.
But every phone has an inbuilt radio transmitter with the help of which it gets connected to the Gsm , Cdma or any other tower.

So my question is :

Is it possible to use this radio transmitter in any way to stream audio files ?

I am an android developer and hence I can code apps for android but I cannot find suitable api to do so. So please let me know if it is possible with some api or in any other way and please give your suggestions.