Step-by-Step Proxy Configuration (Manual)
The most common way is to manually enter the proxy details.
Open the Settings app on your iPhone.
Tap on Wi-Fi.
Find the Wi-Fi network you are currently connected to and tap the blue "i" (Information) icon next to the network name.
Scroll down to the bottom of the network details page to the HTTP PROXY section.
Tap Configure Proxy.
Select Manual.
Enter the required proxy details:
Server: Enter the IP address or hostname of your proxy server.
Port: Enter the port number for your proxy server.
Authentication (Optional): If your proxy server requires a username and password:
Toggle Authentication to the On position.
Enter your Username and Password.
Tap Save in the top right corner.