The funny part about this is if you have an HK SIM card in your phone you have Internet access. If you turn on a VPN on top of that you no longer have an Internet connection. (e.g. WireGuard back to your own network at home.)
If you live in Cn & expect to have any kind of internet access with the wider world, you’ll need a VPN. You can either get an Official Permit for a Govt-Approved VPN (usually for foreign businesses)* … or you can get a real one (technically illegal, but you’re too small fry for anyone to care)