Does my ip address change when?

I have an iphone 4 and was working how often does the ip address change when i'm using 3G. Would it change everytime i'm in a different location?

Ip addresses change all the time, even on your home computer. I suppose as you move between transmitters you ip address could change. It all depends on the phone company. You get leased an IP address with a time limit on it if you don't use it. Some are set for weeks some for minutes.

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