Enable the GamerHash app and receive games, top-ups, gift cards and many other prizes for free.
Gift card adds 10$ to your AppStore account. You may use it only on United States accounts.
HOW TO REDEEM AN ITUNES GIFT CARD (US)?
1. Click the "Redeem" link in the "Quick Links" box of the iTunes Store
2. Type in the code, click "Redeem" and confirm "Redeem Prepaid Card"