Hi, I came across a second hand iPhone 4s that I plan on purchasing. The seller claims it's factory unlocked. Naturally though, I would like to make sure before I hand him a stack of $100 bills. It is my understanding that there is no way of identifying a factory unlocked iPhone (please do correct me if Im mistaken though). Of course, I plan on putting in a micro sim and see if the phone would make a call. The phone might be jail broken. So my concern is if it is unlocked, but not factory unlocked. What should I look for (in cydia I presume) that would indicate it has been unlocked, but wasn't factory unlocked? Or any other way I could tell? (baseband number for example?) Basically, what should I look for? Appreciated.