Manually Inputting an IP Address Into an iPhoneby Bennett Gavrish
With most Wi-Fi networks, when a computer or device connects to it, the network dynamically assigns an IP address. However, you may encounter certain wireless networks that require manual IP address settings, also known as static IP addresses. If you have connected to this type of wireless network from your iPhone, go into the device's Wi-Fi settings to manually set a static IP address.
Tap on the "Settings" icon from your iPhone's home screen.
Go to the "General" menu and tap on "Wi-Fi."
Tap on the blue arrow next to the name of the wireless network you are using.
Tap on the "Static" tab.
Tap in the "IP Address," "Subnet Mask," "Router" and "DNS" fields, and use the onscreen keyboard to enter the desired information.
Tap on the "Wi-Fi" button to save the static IP address and return to the main Wi-Fi menu.