Carrier billing lets you pay for apps, games, or services by charging the cost...

https://lorenzooann734.trexgame.net/does-carrier-billing-work-if-i-switch-to-a-new-phone

Carrier billing lets you pay for apps, games, or services by charging the cost directly to your phone bill. Whether you have a monthly plan or use pay-as-you-go credit, the purchase amount shows up on your next bill or reduces your available balance