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On your phone, open App Store, then tap on the center icon at the bottom named 'Apps'. Scroll down. tap on 'Redeem', then tap on 'You can also redeem your code manually'. Follow the prompts from there. For in-app purchase promo codes, the app will automatically download if the app is free and not currently installed on the device; if the app is paid, you will need to download the app in order to redeem the in-app purchase. Note that a user with a promo code is not allowed to review the associated app.