IPhone 4 won't play USB port in car?

I bought a new car stereo with a USB port and my phone won't play it says error. Phone is running iOS 6.

Iphones usually have a very specific data stream cable you have to use not just a standard usb port… Look at your brand/model head unit see if they offer ipod/iphone datta cable/port

Check the manufacturer website and see if there's a firmware update for the radio. Many of the recent radios out on the market right now were designed for iOS5 and not iOS6.So since there's a new operating system on the iPhone the radio is going to need updates to make it compatible again.

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