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

https://harpersnewinsight.brightsora.com/posts/why-does-carrier-billing-show-up-as-a-weird-line-item-on-your-bill

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