I think you could have authenticated yourself with a check card, not with a credit card.
When I tried to sign up for a cheap phone, it didn't work.
Or did you decide to block the check card?
638 2018-09-10 Gentleman
http://m.mk.co.kr/news/headline/2018/311251
It looks like it's possible here
I don't know why I blocked the check card
I'm going to get it certified and issued just like a credit card anyway
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