I read on celcom officials fb on comment said all telco had standardised their terms & regulation. It is a must to have credit card for easyphone/zerolution for billing charges. Don’t know true or not.

But for celcom easyphone, whether you’re more than 12 months existing customers or new customer it is mandatory to have credit card for billing charge starting 14 March 2019. (Based on celcom blue cube agent explanation during signing my new easyphone contracts)