After joining my personal WiFi with the SSID “%p%s%s%s%s%n”, my iPhone permanently disabled it’s WiFi functionality. Neither rebooting nor changing SSID fixes it :~) pic.twitter.com/2eue90JFu3
— Carl Schou (@vm_call) June 18, 2021
If this should happen to you, resetting your iPhone’s network settings should fix the problem. Go to Settings > General > Reset > Reset Network Settings > Confirm. Once your iPhone restarts, set up your Wi-Fi as you normally would.