My phone plan has apple tv with it , but I need to change payment method to buy the entire Grimm series
Changing Apple TV + Payment method
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My phone plan has apple tv with it , but I need to change payment method to buy the entire Grimm series
TV shows-to-buy are not part of the Apple TV+ streaming service as included with your mobile plan. Buy or rent titles are separate. Buy movies and TV shows from the Apple TV app - Apple Support
Changing Apple TV + Payment method
Your Apple ID should have a linked payment method, that can be charged when making purchases from the App Store or iTunes Store (media).
Payment methods that you can use with your Apple ID (by country) - Apple Support
Add a payment method to your Apple ID - Apple Support
If you need to change or update your Apple ID payment method - Apple Support