Help with App Store promo codes
App Store promo codes let you redeem a free copy of an iPhone, iPod touch, iPad app by entering a code into iTunes or the App Store app. Each promo code is unique and can only be used once. They typically look like: 74NF6JJF3PXY .
Redeeming promo codes from iTunes
Redeeming promo codes is easy. Simply click the Redeem link that can be found on the right hand side of the iTunes Store Home page or App Store page in iTunes on your computer. You’ll see Redeem under the Quick Links section.
You can also redeem a code from anywhere in iTunes by clicking the down arrow next to your account and selecting the redeem option from the drop down menu.
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Once you’re on the Redeem page, paste the promo code into the field provided and click Redeem. You may have to enter your password. Your free app should start to download.