I want an iPhone 4 and will buy one on eBay for probably like 200 bucks. However I can't afford the data plan. I am techy and can easily figure out an unlock but I don't know exactly what it does. I know unlock allows usage on other carriers but does it allow usage without a data plan? And if you get a factory unlock does it f' it up everytime you restore it like a regular one does? Or does a regular one even f' it up? I don't know I have a touch. So fill me in, please and thank you.