Im looking to sell my iphone 4 this weekend and use my 3GS until lauch day of iphone 5. My plan was to backup my iphone 4 in itunes and then leave itunes alone until the 5 comes out and then restore from 4 backup. My question is, can I just pop out my sim after back up, throw it in the 3GS and be on my way? I don't have to plug into itunes if I don't want to, do I? I understand my email won't be set up, my apps won't be there, OS won't be updated, etc, but it will work, won't it? Or do you recommend plugging into itunes and restoring the 3GS from the 4 backup? I'm just don't want to screw anything up by not having enough memory in the 3GS to hold the entire backup. Im just confused thinking about it this morning. What would be the best way to go about this Thanks guys!