China put into effect new regulations that require Chinese telecom carriers to scan the faces of users registering new mobile phone services, a move the government says is aimed at cracking down on fraud.
The rules mean millions more people will come under the purview of facial recognition technology in China.
Supermarkets, subway systems and airports already use facial recognition technology. Alibaba hotel in its headquarters city of Hangzhou where guests can scan their face with their smartphones for advance check-in.
The metro systems of some major Chinese cities will use the technology to "classify passengers" for "different security check measures."