So my sister got the iPhone 3GS and were both new to the iPhone world. I just got a used 2G model for free and jailbreak/unlock it this morning. I don't have a data plan but she does. Is there any way I can remove the data plan? I read threads how some people call at&t and demanded them to remove it and it seems there are some success and some not so lucky. But these threads were for the iPhone 3G and were fairly dated. Think this method still work? If not is there any alternative method?