Carrier billing lets you buy apps, games, or digital content and charge the...

https://wiki-zine.win/index.php/Why_Does_Carrier_Billing_Show_Up_as_a_Weird_Line_Item%3F

Carrier billing lets you buy apps, games, or digital content and charge the cost directly to your phone bill. If you have a monthly plan, the purchase appears on your next bill. For pay-as-you-go users, it’s deducted from your available credit