What is the sub account? How does it work?
Sub account can be created under your main account, and you can transfer USD/BTC/LTC to your sub account. Sub account can be used to trading, but is not able to make any withdrawals.
How to open the sub account?
Click on the “Security” button, then choose the “Profile”, then you can see the button named “+Sub Account”.
Sub account cannot share same phone number with main account and the maximum amount to create is 10 on OKCoin international.