How do I add carrier billing

Hi MAMW,

welcome toi the Apple (user-to-user) Community.

Re: "How do I add carrier billing"

Seems Apple only accepts carrier billing in some countries or regions.

You can check the payment methods that Apple can accept in your country or region:

Payment methods that you can use with your Apple ID - Apple Support

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To keep an account active: You may need to add a new payment method before you can delete an old one.

How to: Add a payment method to your Apple ID - Apple Support

How to delete an Apple ID payment method: Remove a payment method from your Apple ID - Apple Support

How to change an Apple ID payment method:

If you need to change or update your Apple ID payment method - Apple Support

If needed:

Billing and Subscriptions info / support / contact:

Find answers to your questions about purchases, subscriptions, payments, and billing:

Subscriptions and Billing - Official Apple Support

All the best :-)