[xkcd-sucks]

I've had consistent, unrestricted access to google/facebook/videos from 1989, all over China, using a tmobile sim card registered in another country.

A financial services "startup" in sz manages to run a VPN with some sort of official permission. Not sure what sort of connections made this possible...

[uola]

Yes, roaming works. Preferably you use a HK sim. At least foreign companies can buy a connection to a foreign IX that doesn't go through the firewall. You can pickup HK 4G in SZ without roaming. International traffic from China sucks in general, not only because of the firewall. You can buy better international connectivity in some cases.