Why is iTunes disabled on my phone
Why is my iTunes disabled?
iPhone 6s, iOS 12
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It is usually a billing-related issue. If your account has been disabled in the App Store and iTunes, it isn’t something that you can fix yourself. You will need to contact Apple Support. The following Apple article includes a link that you can use to contact Apple Support: If a message says 'Your account has been disabled in the App Store and iTunes' - Apple Support
This is primarily a user-to-user support forum; other Apple users like you.