Help to bypass restrictions in countries

I’m going on a trip to China and I know that Tiktok is banned for minors there, idk if this is linked to the internet and wifi but I still want to be able to talk with my friends and know that the easiest solution is a VPN but I can’t find a reliable, free one on IOS. If anyone could provide help it would be great. (Ive already tried a few: Windscribe and the blue key one but their free plans just didn’t work for me)