iCloud and iTunes
Is it true that I can’t use iTunes cards to pay for my iCloud monthly payment?
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No, it isn't true.
iCloud storage plans and pricing - hhttps://support.apple.com/HT201238
"Accepted payment methods for iCloud storage upgrades include credit cards, debit cards, and iTunes Store credit. If you don't have enough iTunes store credit to complete your upgrade, you'll be charged the remaining amount. "