[ehhthing]

Assuming what you mean is over mobile data (and not over wifi), mobile data works differently than typical internet. You can think of it like when you connect to a mobile network what you're actually doing is making an IPsec connection to your carrier, with all data flowing over that IPsec connection. As such any carrier with a roaming agreement in China will bypass the GFW entirely -- and this is by design, Chinese carriers have to whitelist the APNs of western companies they do business with.