Keepgo doesn't list Macau as supported, but it provided connectivity through Smartone while we were there, Facebook and Gmail worked

I used the Keepgo SIM in my android phone for 5 months in Europe and it worked very well.

While the Keepgo can be somewhat tricky to get going once in a while, their support effort and followup could not be better

Keepgo was great

Worked fairly well in Europe - 3G. Terrible in China - edge

and it's just not used as much there (i.e.: most people have 3G capable phones only)

Also in the USA 2g has been discontinued by many phone companies and the last one t mobile is planning to drop 2g as well