Yes, I know it is 999 for emergency services in Hong Kong, but this story got me curious:
American biologist Liz Francis trapped on UK beach dials 911 and is rescued | Mail Online
A US woman found herself trapped on a beach with a rising tide so she called 911. Amazingly the call was routed to US emergency services, who patched her through to a UK emergency operator.
Just wondering if anyone has ever tried that from Hong Kong? I guess you'd have to be using a US phone that was roaming for it to work.