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

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

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