Originally Posted by
PaulC852
Be aware that HK started to require real name registration on all SIM cards a few months ago. The process appears to be moderately easy to hack, but it's there. Any previously purchased SIMs must now be registered otherwise they will no longer work.
Apparently, the 3HK DIY roaming sim does not require real name registration if you only use it outside of Hong Kong, and it comes with a Hong Kong phone number.