iTunes Activation Guide

How to redeem an iTunes code.

Redeem on an iPhone, iPad, or iPod touch

Launch the App Store
Tap Today at the bottom of your screen. 
Select your user icon at the top of the screen (or sign in if needed). 
Tap Redeem Gift Card or Code to enter your code. 

Redeem via the App Store on your Mac

Launch the App Store
On the sidebar, click your name or the sign in button. 
Tap Redeem Gift Card or Code to enter your code. 

Redeem via Android

Launch the Apple Music app. 
Press the menu button. 
Hit Account
Choose Redeem Gift Card or Code
Enter your code and tap on Redeem

Redeem via iTunes for Windows

Launch iTunes
On the menu bar, choose Account, then pick Redeem
Sign in and follow the on-screen directions.