IPhone 4S high pitched whine BMW?

When I plug my iPhone 4S into my BMW via a 3.5 mm jack, there's a constant high pitch whine while music is playing. It is no affected by changing the volume on the phone (unless turned right down).It is nothing to do with the cable - I have tried three different ones, including a high quality home cima shielded cable. Why is this and what can I do to stop it? Get apple to replace the phone, or is it the car? Etc. Cheers.

My car doesn't do this, i also have an iphone 4s, and am using an inexpensive audio cable made by scosche, plugged into my aftermarket head unit. Try a friend's iphone to make sure its not just your phone making the noise

Try the phone without the charger plugged in. You may need to get a ground loop isolator.

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