iPhone and Griffin iTrip (FM car radio adapter)

[prell68]

I have an iPod Nano that I had been using in my car with Griffin's iTrip.  If anyone is unfamiliar with the iTrip, it's just a simple adapter that plugs into a car's cigarette lighter, and has a small FM transmitter hardwired into it.  You plug the iTrip into the standard iPod connector and select the best frequency, and you can listen to your iPod through your car's speakers (albeit in the downgraded/filtered through FM radio quality). 

This set up had been working fine for me with the iPod Nano.  However, after I got an iPhone for Christmas this year, I tried plugging the iTrip into the iPhone.  It charges the iPhone, but seems to have no effect on getting the audio to come through the FM transmitter and onto my car's stereo system.  The only sound comes through the iPhone's internal speakers.  I've tried going through the iPod mode and Settings to see if I can basically force the audio to go through the iTrip, but I haven't found any answers.  This seems odd to me because it wasn't an issue with my iPod--somehow the iPod just knew it was supposed to send the audio through the connector and not just the headphone jack. 

Does anyone know whether I can make the iTrip work with the iPhone?  Or is there just no way to get the iPhone's audio to go through a connection outside of the headphone jack?  Will I have to buy a new/special FM transmitter/car adapter for the iPhone?

[snowbunny]

I have this issue, too. Anyone here able to help?

Thanks!

[gyverkid]

I have a car radio adapter too.  I forget the make (belkin maybe?) but its white and plugs into the bottom of the nano and works fine.  Plugged into the iphone, it says that the device is not made for the iphone, and it does not work.  I think we are ouot of luck