K so i got an iphone 3g and thought i was set until they hit us with the data plan and now we had to cancel it and I'm iphoneless. ATT said that if i ever come back and use the iphone I would have to call them and let them know so they can charge me with the data plan. I asked them why don't i just stick in my sim card from the other phone and roll with that, and they said that the iphone is constantly trying to download data and without that data plan your going to be charged way more. I then found that there was a turn off 3g option, if I turn that off will the iphone stop searching for data thus I won't get stuck with data charges?