iTunes App Store promo codes let you redeem a free copy of an iPhone or iPod touch app by entering the code into iTunes. They exist so iPhone app developers can provide free copies of their apps to reviewers and lucky customers. Each promo code is unique and can only be used once. This is what they typically look like: RWAPJ7XLTHN7 (yes, that’s a real code and yes, it’s been used).
Redeeming iPhone App Store promo codes is easy. Simply click the Redeem link that can be found on the right hand side of the iTunes Store home page in iTunes. Or, you can use this direct link: iTunes Store Redeem.
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.
Unfortunately, promo codes can only be redeemed in the US iTunes Store. This is a restriction put in place by Apple, not by iPhone app developers. It’s not clear why this restriction exists, but as soon as we have the option to give away global promo codes, we will.
It’s also worth noting that developers get a maximum of 50 promo codes per version of each iPhone app.
We frequently give away promo codes for our apps on Twitter and some other iPhone app review sites. If you’d like to get something for nothing, please follow us on Twitter.
We’re using the hashtag of #promocodes in our Tweets now, to help users find promo codes across Twitter.
Developers: We’ve set up a shortcut (tr.im/redeem) that links to the App Store redeem page. Feel free to use it.
1 — Open the iTunes Store, click Redeem

2 — Paste in your promo code

3 — Click Redeem
