I recommend that all friends prepare a Hong Kong data SIM card.

Now, airport restrictions are becoming increasingly strict, and many airports have shut down access. We don't know what the future holds. Even if you set up your own access channel, it may not be stable (it's very possible that your data center IP range could be blocked).
Every friend physically inside the Great Firewall should stay vigilant. The firewall is always there; no one knows when it will be upgraded or intensified. We must ensure we always have a backup method to bypass the restrictions as an escape pod.