Will my iPhone become damaged if I plug it into a direct iPod plug to my radio in my car?

No, you just can’t receive phone calls, etc.

I do this to charge my phone sometimes and I haven’t had any problems, like peedub said I just don’t recieve any incoming calls or messages

I do it daily; and receive calls. It won’t damage your phone, but it could damage your speakers with GSM noise.

I haven’t experienced a problem. If you turn off the radio by saying Yes, you can’t receive calls since you are in Airplane mode. If you select no, you still can. Though you will probably experience some GSM noise in your speakers.

cool, thanks for you help. Just wanted to make sure it wouldn’t mess up my phone.