What is Promo Code and what it is good for
Promo code is a unique code that allows you to get an application for free. Once you got lucky to receive a Promo Code you need to redeem it on AppStore.
2. Tap the 'Featured' tab on the bottom navigation bar
3. Scroll down and tap 'Redeem'
4. Enter the Promo Code and tap 'Redeem'