Q: If you were buying an iPhone 3GS off of Craigslist for an Xmas gift for your young child ... what would you be on the lookout for NOT to buy? Personally, based on my prior experience with the 3G, I'd prefer a non-jailbroken iPhone 3GS so I could start fresh But, what iOS would I NOT want to get (which may be hard to JB)? And, which bootloader/bootrom versions should I NOT buy? Is there anything else in an iPhone 3GS to be on the lookout for? HISTORY: Naively, over the summer, I bought an already-jailbroken iPhone 3G for one of my kids, and only recently did I find out it's vastly important exactly what bootloader is installed (as the one I have is not downgradable): - Why won't the bootrom version show up in WinXP Device Mgr iPhone 3G 3.1.3 BB 06.15.00 I also had to downgrade the iPhone that I bought, from 4.2.1 to 3.1.3 just to run certain applications (Cycorder, in particular): - Why would Cycorder simply flash black & blank out on a jailbroken Ios4.x iPhone 3G? In the end, if I knew then what I know now, I would have bought: a) A virgin iPhone 3G with an old iOS on it (e.g., iOS 3.1.3 would have been ideal) b) An iPhone with the 5.8 bootloader version c) An iPhone with the native (not iPad) baseband installed QUESTION: Q: What would you consider danger signs to be on the lookout for when buying an iPhone 3GS on Craigslist for use on T-Mobile?