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By this time my answer is no use, but should help someone else who's having the same problem as I did too go through this and was confused. When you redeem your code for the 4 months free it will ask you to enter a payment method. Add you payment method and once again redeem your code. I had to go back and enter the code as it did not do it automatically after I entered my payment method. From what I read you must make sure to cancel before the 4 months are up or it will charge automatically. Even if you cancel before your 4 months are up you will still have access to the music and it will stop working once your free "subscription" is up.
Sorry, there was a problem. Please try again later.You need to add a payment method to subscribe any apple service.
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![Apple Music - Free for 4 months (new subscribers only) [Digital]-Front_Standard](https://pisces.bbystatic.com/prescaled/500/500/image2/BestBuy_US/images/products/6391/6391978_sd.jpg;maxHeight=100;maxWidth=60)