Ok so Iím going to buy an IPhone 4 thatís jail broken so I can unlock it for boost mobile. Now I know different carriers use CDMA and GSM. Since sprint has the iPhone do I have to find one so I can unlock it for boost or can I use any carrier? Also to unlock it for boost what all will I need? The threads Iíve read have not been too specific and I donít want to be unprepared. I currently have the Samsung Prevail through boost. Thanks in advance for any help!!!!