Hello -- I no longer have the phone in question, but I'm trying to remember the OS (either 3.x or 4.x) I had on my 3GS (8GB). It was an 8GB, Black. Bought it in 2011. I remember being able set a home wall paper and a lock screen wall paper. It had auto correct. Is that enough to determine if it was iOS 3.X or 4.X? I never updated the OS, so it's whatever it shipped with.