Need some advice form all of the experts here. I am not eligible to upgrade my 3gs until July 2011, however my husbands line is upgrade eligible now. He does not care about getting a new phone so I was reading in the forum that I could use his upgrade and then put my sim card in the 4g. My questions are: 1) Are the sim cards going to be the same size as the 3gs? 2) Am I going to have a problem cancelling the data plan on his line after I purchase the 4g (since I am going to be using it on my # and he would go back to using his old phone) Any suggestions are greatly appreciated.