All HK and Taiwan SIM users must finish real-name registration before using data in Hong Kong/Taiwan, otherwise, the plan can’t be activated. Customer can complete the real-name registration through local network provider website:
Click this link to register:
https://global.cmlink.com/store/realname?LT=en
Click here check the registration status:
https://www.icard.com.sg/pages/check-your-package-details
"Certified" means approved, can just restart phone and use when you are in HK/Taiwan.
"Not certified" means not registered/not successfully registered.
You can do it anywhere, package only will start when you in HK/Taiwan.
Sample: