If you’re experiencing connectivity issues after upgrading to iOS 13 or later, try the following:
- Click HOME >> Settings >> System >> Detail information >> Wi-Fi .
- Long press the entry of the iPhone hotspot and then select “Modify network” from the popup menu.
- Click “Show advanced options”.
- Change IP settings from DHCP to Static.
- Set IP address to 172.20.10.2, gateway to 172.20.10.1 and DNS server to 126.96.36.199.
- Now the Internet connection should work properly.