Carrier billing lets you buy apps, games, or services and charge the cost...

https://threadvistax.com/s/q03G8mw5-OQaVUFJQUejD

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