Hi, I am prepping my device for sale but I am stuck. It is a USA Factory Unlocked iPhone 4 model. I want to restore and clear out my personal info but I believe it will be stuck at the dreadful 'Plug Into iTunes' screen afterwards. The problem is I LOST the AT&T micro sim that it originally came with. I don't think the T-Mobile SIM is gonna activate it. Is there anyway I can avoid this? I greatly appreciate your help!!