Step 1: Open App Store->Tap top-right icon->Scroll down to bottom to Sign Out-> Scroll to the top-> Then sign in with a non-China Apple ID, Note: You should never sign in your iCloud with this public Apple ID, you don't need to change anything in iCloud.
Step 2: After Sign In, open App Store search "Potatso", and then download this app
Step 3: After download, please open Potatso and add Subscription Url, click here to get green subscription url.
Please contact us via wechat for help if any issue (Don't use Potatso to scan this qr code):
Step 4: Please first Enable Smart Routing, and then choose a server from Proxy, and then click Start to connect. you would see vpn icon on status bar(iPhone X has no vpn icon due to limited space). open safari and try to connect google.com, if you can open it, it means all is good now.
Step 5:Quit Apple ID you entered on Step 1, change it back to your own Apple ID.