My iphone doesn't work with my car stereo or ihome?

My car has a charger which also works for playing music and has all my music on my GPS screen (i have a VW 2013 Beetle). One day, my car stereo and my iHome stopped playing my music and said my phone didn't work with the accessory. I have an iPhone 4 if that helps. My brother's iPhone 4 works both in my car and in my iHome, so something is definitely wrong with my phone. What do I do?

You can clear away all the pair history. And try again

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