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There are some apps that stream FM or AM stations iheartradio and iradionow are two worth looking at.
 
X-tra Hardware required

Negative, in order to transmit via FM you will have to get a hardware device. Search online, there a ton of cables with built in FM Transmitters. I personally own the Belkin TuneBase FM with Hands-Free: http://catalog.belkin.com/IWCatProductPage.process?Product_Id=492841 so I can move it from car to car.

To get the best sound quality, you should look at getting an iPhone/iPod aux adapter for your factory radio or a radio that has AUX inputs because FM transmitters can be kind of sketchy from time to time.
 
Negative, in order to transmit via FM you will have to get a hardware device. Search online, there a ton of cables with built in FM Transmitters. I personally own the Belkin TuneBase FM with Hands-Free: http://catalog.belkin.com/IWCatProductPage.process?Product_Id=492841 so I can move it from car to car.

To get the best sound quality, you should look at getting an iPhone/iPod aux adapter for your factory radio or a radio that has AUX inputs because FM transmitters can be kind of sketchy from time to time.

https://forums.macrumors.com/threads/802381/
 
Negative, in order to transmit via FM you will have to get a hardware device. Search online, there a ton of cables with built in FM Transmitters. I personally own the Belkin TuneBase FM with Hands-Free: http://catalog.belkin.com/IWCatProductPage.process?Product_Id=492841 so I can move it from car to car.

To get the best sound quality, you should look at getting an iPhone/iPod aux adapter for your factory radio or a radio that has AUX inputs because FM transmitters can be kind of sketchy from time to time.


how do you like the tunebase? ive read a couple of reviews that it will break your iphone? and is it not compatible with 3gs?
 
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