lagoonclug,
I also have a jail broken iphone.
I downloaded an app called: Ip manager. it allows you to see your external ip and reset it and get another one from the app. and also keeps a list of ip's used.
I have also just tethered my iphone and went to system, and then put airplane mode on for 5 seconds and then flip it back on this refreshes the connect and the you have a different ip address.
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