I have problems using WiFi on my Apple iPhone 13 Pro
If you can't use WiFi on your phone, there may be several causes of the problem.
Find a place with available WiFi networks and try establishing a connection again.
Open the internet browser on your phone and try to load a website. The internet browser is redirected to the homepage of the WiFi network. Follow the instructions on the screen to log on to the WiFi network.
Contact the administrator of the WiFi network to obtain the correct connection settings.