Carrier billing lets you buy apps, games, or services and charge them directly...

https://writerhavenx.com/s/KbQ4FEIq0nGHCYEVd9B-U

Carrier billing lets you buy apps, games, or services and charge them directly to your phone bill. If you have a monthly plan, the cost appears on your next bill. For pay-as-you-go users, the amount is taken from your available credit