My mom wants to get an iPhone to replace her old sony ericsson. She has no use for the "internet" and really likes the iPhone. AT&T told me that she must have a data plan in order to use the iPhone which I think is stupid. Not everyone wants or needs the internet on their phones. So I'm thinking about finding a used iPhone for sale off craiglist. Would it be possible to buy one and take out her simcard which has just a voice plan and use that on the iPhone or will AT&T find out and automatically tackle on the iPhone data plan? Anyone who knows anything about this please let me know. Thanks!