Hello. I'm using prepaid plan now and I had paid with my sister's card when I started. I'm going back to Korea tomorrow which means I'm not going to use this service anymore. I just received message from koodo service yesterday that my plan will renew from Aug 19th. And I'm just wondering how to stop the service before I leave. What should I do? Is it going to be paid automatically with my sister's card if I do nothing about it?