Carrier billing lets you pay for apps, games, or digital content by charging...

https://www.slideserve.com/eogernrhbu/is-carrier-billing-the-same-as-paying-by-text-clearing-up-common-confusion

Carrier billing lets you pay for apps, games, or digital content by charging the cost directly to your phone bill. If you have a monthly plan, the purchase is added to your next statement