Hi have a Iphone 2G that I just upgraded to a 3GS. My 2G is standard ie not unlocked or jailbroken. I would like to give my 2G to my kid. I want them to be able to make phone calls but only be able to access the internet functions via WIFI (ie I am not getting them a data plan). Rght now my kid has a cheapo samsung phone with AT&T. Can I just take the SIM out of their Samsung and put it in the Iphone 2G or is there something else I have to do to make it work?