to download app free on iPhone. Redeem App Store Promo Code in iPhone Camera. Step #6: Enter your, apple ID password. Though there is no groupon toulouse bijoux such thing as a free lunch in the world, people always love to get something free. Step #7: Now type in the promo code to download the app. Step #5: Tap on Redeem button.Find How To Redeem App Store Promo Code On iPhone. Sponsored Links, step #1: Launch App Store on iPhone/iPad. Many app developers at times offer promo codes to users to download and try the app free on iPhone. You can use the built-in camera code promo wickey on your iPhone to redeem the code. Now, you can download the app. Please follow first six steps mentioned above.