Apple has enabled carrier billing
in Belgium and Norway, expanding upon the feature's existing availability in Germany
, Saudi Arabia, and the United Arab Emirates. The feature is limited to select carriers in each country — share if yours is supported in the comments.
The payment method enables customers to pay for iTunes content, App Store apps, iBooks, and Apple Music subscriptions without needing a credit or debit card, or even a bank account. Instead, purchases are added to a customer's mobile phone bill and paid off at the end of the month.
Apple has a support document explaining how to set up carrier billing
on iPhone, iPad, or iPod touch and Mac or PC.