Carrier billing lets you pay for apps, games, or digital content by adding the...

https://noon-wiki.win/index.php/Carrier_Billing_for_Parking:_What_Happens_If_I_Hit_My_Limit%3F

Carrier billing lets you pay for apps, games, or digital content by adding the cost to your monthly phone bill or subtracting it from your prepaid balance. It’s a simple way to make purchases without needing a credit card or separate payment app