[revealer]

Presently, understanding the protocol is for those who receive HRW SMS and ART test positive must isolate themselves at home.  If they have symptoms such as fever, cough, flu or runny nose, they must visit a nearby SASH PHPC for immediate medical attention.  They can go out only when they are ART test negative indicating they have recovered.   

https://www.gowhere.gov.sg/art/faq

For others, such as doing the self-tests at home or somewhere else,    there is no such protocol or requirement.  This brings about some saying the rules have been changed.  They claimed they can go out and do shopping etc as usual,  not aware that this is very irresponsible behaviour as they can infect others easily.