Hong Kong and Macau
999 was introduced to Hong Kong during British rule and continues to be used following the transfer of sovereignty.
Macau also adopted the 999 number; it also introduced two emergency hotline numbers: 110 (mainly for tourists from mainland China) and 112 (mainly for tourists from overseas).
The worldwide emergency number for GSM mobile phones, 112, also works on all GSM networks in the country. Calls made to this number are redirected to the 999 call centre.
Read more about this topic: 999 (emergency Telephone Number)