Billing Address
I need to buy more storage. I need to change my payment card & payment address.. I’ve tried several times but failed.
iPhone 6s, iOS 13
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See this Apple support article—>Change, add, or remove Apple ID payment methods - Apple Support
Note that you cannot add storage to your phone; the only storage you can purchase is iCloud, which is for syncing and backups. It does not extend the capacity of your phone.