Carrier billing lets you buy things using your phone. Instead of using a credit...

https://xeon-wiki.win/index.php/What_Should_I_Do_If_I_Do_Not_Recognize_a_Carrier_Billing_Charge%3F

Carrier billing lets you buy things using your phone. Instead of using a credit card or app, the cost of your purchase is added to your monthly phone bill or taken from your prepaid balance