Storage on an iPhone
How to pay for more storage with a gift card
iPhone 12, iOS 15
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How to pay for more storage with a gift card
iPhone 12, iOS 15
Assuming that you mean an Apple Gift card, redeem it according to these instructions.
How to redeem your Apple Gift Card or App Store & iTunes gift card - Apple Support
If you have money in your Apple ID balance from gift cards, your credit or debit card will not be used to pay for the storage. The money in your Apple ID account will always be used first. I pay for my Family iCloud storage with gift cards.
Assuming that you mean an Apple Gift card, redeem it according to these instructions.
How to redeem your Apple Gift Card or App Store & iTunes gift card - Apple Support
If you have money in your Apple ID balance from gift cards, your credit or debit card will not be used to pay for the storage. The money in your Apple ID account will always be used first. I pay for my Family iCloud storage with gift cards.
Be aware that you can't buy more storage for your phone, it is a fixed size. You can purchase a monthly subscription for more iCloud storage.
Storage on an iPhone