is there any way to convert gsm radio frequency to fm radio frequency?

Question

I want to make an application that play fm radio in iphone but from searching i found that there is no hardware - fm receiver in iphone to play FM directly(offline). so I want any solution that convert gsm radio frequency (900 Mhz - 1800 Mhz :india) to FM frequency (88.1 Mhz - 108.1 Mhz) programmatically or any other apple hardware.

Answer 1

It's a clever thought, but you can't just retune a GSM receiver into the FM band. Even if you could, you can't get access to the raw analog output on an iPhone (which you'd then have to demodulate yourself, which is the one piece of this that is just difficult, rather than impossible).

The piece of gear you would need would be an external FM receiver. That's completely buildable; just not in software. See the Griffin iFM for an example.

Answer 2

First, I don't think you have access to the raw GSM signal of the phone like that. Second, why would you want it to convert to FM? Are you going to broadcast it? I really think is not possible what you want to do.