So I upgraded to the iPhone 4S and was preparing to sell my old 3GS. I thought I'd go ahead and upgrade to iOS5 for the new owner, so I did that. However, I want to make sure all data on the iPhone is GONE before I sell it. I was planning to update to the new iOS, and then do an erase on the phone. Since the SIM is out of the phone now, I can't get by the activate screen on the phone. Does that mean the phone is already wiped of all data and I can go ahead and sell it? Or do I need to somehow downgrade to 4.3 and then do a wipe first? Thanks!