How do I renew my subscription to change the IP address on my iPhone
Follow these steps to request a new IP address for the iPhone from the router:
On the Settings screen, tap Wi-Fi.
A list of available networks appears. The one currently connected has a blue check mark. Click the information (I) icon to the right of the network name.
Various data points and Settings for an active Wi-Fi network appear. Click on renewal.
Click renew again at the bottom of the screen.
How do I enter a static IP address on an iPhone
You can also manually change the IP address on your iPhone. However, you must be able to control the Wi-Fi router (or have a static IP from the network administrator). Enter a static IP address for the iOS device as follows:
Open the application.
On the Settings screen, tap Wi-Fi.
A list of nearby networks appears. The link is marked with a blue check mark. Click the information (I) icon to the right of the network name.
Click Configure IP.
Press Manual.
Displays a new section labeled “Manual IP”. Enter the static IP address and the corresponding subnet mask and router address