WeChat is good advice!
Anyone that goes to China should get it. Add people in the west before you go (make them install the app) and add people while in the middle kingdom (it’s true that everyone uses it). When you get to China and nothing loads from the outside world you will not regret your proactivity. VPNs do bypass the great firewall but they are getting slower and slower and eventually the party will figure those out too so embracing the censorship is sadly they way to go.