Question: how to download music on iphone with itunes card?
Answer: Tap "Today" in the bottom menu, and then tap your profile icon in the top-right corner. ... 
Tap "Redeem Gift Card or Code." ... 
Tap "Redeem." ... 
Tap "For You" at the bottom of the screen. ... 
Tap your profile icon in the top-right corner. ... 
Tap "Redeem Gift Card or Code."