Hi. I'm completely new to ipad, and clueless. Yesterday my mother got the new one (=ipad 3?) with ver 5.1. It is Wifi only, but Best Buy says she can trade it in (+ more $) for a 4G version. Big concern is her credit card info and passwords which presumably are stored on the HD. BestBuy says before re-selling it they do a full factory reset, which will erase everything. My fear is that with the right tools and skill, "erased" data can still be recovered. Any opinions on this?