Hey guys, I currently have a Blackberry Bold 9000 on AT&T and I'm making the switch to the iPhone 4G soon Please Register or Log in to view images. I pay for the data plan for BB which gives me unlimited internet access and BBM. I am not eligible for an upgrade but my dad is. My dad wants my blackberry so we're gonna trade. But I don't know if this will work. Is it okay if my dad buys an iPhone 4G since he is eligible for an upgrade and pays 200 and pays for the plan but I put my SIM card in it and use it for myself?? I know his SIM Card will work in my BB but will my SIM work in the iPhone?? Will I need to unlock or activate it?? Because I really just want to jailbreak and not have to deal with unlocking. Thanks in advance.