hello guys. I have a ipad 1 16G（wifi+3G) in good condition( there only show a bit scratch on the back). perfect function.... there is a guy want to trade his iphone 4 16G（not 4S) with my ipad.he said the condition is 9/10. and Jailborken and with gevey sim tray i have no idea,is this a good trade? if yes, what i should pay attention when we trade? what i should check? say some detail. I don't use iphone before. come here want to get your help thanks a lot guys, have a nice weekend!