Hey guys I just recently sold my iPhone 5 to some guy I know and I plan on buying the samsung galaxy s4 on eBay. My sister told me I have to call AT&T switch the imei #. And is iPhone data the same as other smartphones? Like for example if you put your sim card in a iPhone it charges $30 a month for it. Would it be the same for the s4? And do I really have do any of this, I just wanted to sell my iPhone 5, buy the s4 on eBay, pop my sim in and be good to go.