How do I force my iPhone to obtain a new IP-address?

What is the fastest way to force my iPhone to obtain a new IP-address?

One way to get a new IP-address is to simply restart the iPhone, but that is rather slow. Is there any faster way to obtain a new IP-address?

I'm running iPhone OS 3.0 and I'm getting my Internet connectivity over GPRS.

4 Answers

The quickest way I have found to reset all the network connections (wifi, 3g/edge/gprs) is to go to settings and turn on "Airplane Mode" for a few seconds and then turn it off again. It will reset all network connections.

Settings-->Airplane Mode

I have found this also to help when my phone doesn't connect to 3g in a known 3g area.

Turn wireless off and on again? It may not actually get a new IP as it may just renew the lease.

I don't have a ipod/iphone so I don't know if there is a renew IP button, but i would take a look around any network settings, especially the page on wifi where it says what your current status / connection is (going from memory on my brothers one)

There is definitely a "Renew Lease" button.

Go to Settings, Wi-Fi, click the blue arrow next to a network and you'll see it. You can also tell it to "forget" the current network it's on.

Ok, go into the settings and change the wifi setting inside the chosen network from DHCP or whatever to Static. Copy all data except IP address. Take the first 3 sections of your assigned IP and copy them. Ex: IP is 143.23.0.198, copy over 143.23.0. then make up the last 3 didgets, making sure not to use 0,1, or 255. Those are specifically reserved for network tasks. then you should be good. it worked for me.