What is the source of your music …. Is it a streaming service or files on your ipod?
In my case, I rarely use streaming service unless it is a podcast as all of my music is saved to files.. i have an ipod … but never use it as I have all my music files saved on my iphone.
So when I am in my car, music automatically streams via bluetooth (or cable … if i connect the cable) from my iphone. Phone calls continue to work on the same phone (just auto-muting the music) …. In my case playing music does not use data as the files are on my iphone. However, I sometimes listen to podcasts in the car … and that does use a few megabytes of data if the podcast has not yet been downloaded.
So, it is not clear to me why you need your ipod …. Just load your music files onto your iphone and all is well in your car with that device only.
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