How to Change the IP on Your IPhone

Your router uses a technology called Dynamic Host Configuration Protocol to assign a unique IP address to each device on your network. If your iPhone is connected to your wireless hot spot, but you're unable to access websites or other Internet services, your phone may be sharing its IP address with another device on the network. To obtain a new IP address from your router, refresh your network configuration from the Settings app. Your iPhone will release its existing IP and request a new address from your router.

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You should renew your IP address any time you reconfigure or reset your router.
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Step

Tap "Settings" from the Home screen and then touch "Wi-Fi."

Step

Select your wireless network and then scroll to the bottom of the screen.

Step

Touch "Renew Lease" twice to reset your IP address.