Yahoo answers wasn't the place to post this, so I'm copying it over straight from there. It may sound a little odd Ironically, I am an iOS software developer, but I have never had an iPhone newer than a 3G in my life (until now). I just use iPod Touches. On Craigslist, someone contacted me about my iPhone 4S I got a few days ago (mine's 16GB). I wanted to trade my new iPhone and my 32GB 4th generation iPod Touch for a 32GB iPhone 4S. He said he had a factory unlocked 64GB iPhone 4S, still sealed in the box, that he wanted to trade for my iPhone, iPod, and 40 dollars because he was apparently getting a divorce. He said he bought it off of Amazon. I told him that would be a good deal, and I accepted, but telling him that I must open the box and make sure there was the correct iPhone inside. He said he didn't want me to open it, (probably for return if the trade didn't work out) and that we could go in and the people at AT&T could tell me it was an iPhone 4S and everything. (We're meeting at an AT&T store). I told him that if I opened the box and made sure everything seemed good and he wasn't trying to scam me, I would definitely accept the trade (negating the need to return it), which he agreed upon. My question is, can someone give me some pointers for making sure everything is legit? Being very familiar (mostly) with iDevices, I know to look for the antennabands in the correct locations for the 4S and the SIM card slot being present, and I'm also going to check the model number on the back. I'm going to plug it into my car if it's not charged, and make sure it's 64GBs via the settings app. My question is, do factory unlocked iPhones allow access to the phone features without a SIM card being present and activated? I have a blank AT&T SIM card that I use for iPhones so I can use them like iPods, but will it be able to get activated without a computer or WiFi? If not, is there a way to check the storage size without having full access to the phone? Also, how do I know if it's even factory unlocked at all? I want to use the iPhone on T-Mobile (yes, I know there's no 3G.) Finally, I just need to know how not to get scammed. Has anyone heard of a scam similar to this before? I'd really appreciate any tips. I always get paranoid when things seem to be a good deal. Thanks!