There are special virtual SIM cards that provide access to services from mainland China, as well as VPNs that function normally without issues. I used both while I was in China.
Yeah, have used one. Mine was a downloadable eSIM and meant for foreign travelers with 1-week plan. It actually establishes an IPsec VPN to the origin country. Beijing dare not to block foreigners' roaming services.
There are special virtual SIM cards that provide access to services from mainland China, as well as VPNs that function normally without issues. I used both while I was in China.