A lot of things like connecting to a public WiFi (which tries to connect to a Google page which doesn't work), Google PlayStore, Google Maps, email apps, etc.
In China you need an Android that doesn't come preloaded with Google stuff or an iPhone which just works fine incl the AppStore.
It's very strange that Google doesn't offer at least basic support there.
A lot of things like connecting to a public WiFi (which tries to connect to a Google page which doesn't work), Google PlayStore, Google Maps, email apps, etc.
In China you need an Android that doesn't come preloaded with Google stuff or an iPhone which just works fine incl the AppStore.
It's very strange that Google doesn't offer at least basic support there.