How To: Redeem an iTunes Gift Card or Promo Code from iTunes or iOS device

For some people the best way to buy apps, music, movies, books and more from the iTunes Store is by filling their iTunes account with iTunes Gift card credit; this way you don't need a credit card. But for those that still haven't done this, here's how you can redeem an iTunes Gift Card and even a promo code to download free apps, songs, etc. from iTunes.

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