Payment method.
I couldn’t add mobile phone billing as a payment method, it says contact iTunes support to complete this transaction.
iPhone XR
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If you haven't already done so contact iTunes Support as instructed to do (these are user forums, not iTunes Support) :
- go to http://www.apple.com/support/itunes/ww
- click on your country's flag (the country where you live, and which is therefore the country on your account)
- click on Contact Support towards the top right
- click on Get Help under 'Talk To Us'